diff --git a/doc/NEWS.Rd b/doc/NEWS.Rd
index 7885cff13e2..4273745aacb 100644
--- a/doc/NEWS.Rd
+++ b/doc/NEWS.Rd
@@ -974,6 +974,10 @@
       in the installer is now the full reference index, including all
       base and recommended packages.
 
+      \item \R help pages and manuals have no ISBNs because ISBN
+      rules no longer allow constantly changing content to be assigned
+      an ISBN.
+
       \item The Windows installer no longer installs a Start Menu
       link to the static help pages; as most pages are generated
       dynamically, this led to a lot of broken links.
diff --git a/doc/manual/R-defs.texi b/doc/manual/R-defs.texi
index 8ada1377762..4d175a39f45 100644
--- a/doc/manual/R-defs.texi
+++ b/doc/manual/R-defs.texi
@@ -63,11 +63,11 @@ except that this permission notice may be stated in a translation
 approved by the R Core Team.
 @end macro
 
-@set ISBN-FAQ ISBN 3-900051-08-9
-@set ISBN-admin ISBN 3-900051-09-7
-@set ISBN-data ISBN 3-900051-10-0
-@set ISBN-exts ISBN 3-900051-11-9
-@set ISBN-intro ISBN 3-900051-12-7
-@set ISBN-lang ISBN 3-900051-13-5
-@set ISBN-ints ISBN 3-900051-14-3
+@set ISBN-FAQ 
+@set ISBN-admin 
+@set ISBN-data 
+@set ISBN-exts 
+@set ISBN-intro 
+@set ISBN-lang 
+@set ISBN-ints 
 
diff --git a/doc/manual/refman.top b/doc/manual/refman.top
index e4159acaedc..5598ca19fd6 100644
--- a/doc/manual/refman.top
+++ b/doc/manual/refman.top
@@ -73,8 +73,6 @@
   welcome to redistribute it under the terms of the GNU General Public
   License.  For more information about these matters, see
   \textsf{http://www.gnu.org/copyleft/gpl.html}.
-  \par\bigskip\noindent
-  ISBN 3-900051-07-0
 \end{titlepage}
 
 \pagenumbering{roman}
diff --git a/src/library/base/inst/CITATION b/src/library/base/inst/CITATION
index 44c3b29ae35..954b9dcdcf5 100644
--- a/src/library/base/inst/CITATION
+++ b/src/library/base/inst/CITATION
@@ -4,14 +4,13 @@ bibentry("Manual",
          organization = "R Foundation for Statistical Computing",
          address      = "Vienna, Austria",
          year         = version$year,
-         note         = "{ISBN} 3-900051-07-0",
          url          = "http://www.R-project.org/",
          
          textVersion = 
          paste("R Core Team (", version$year, "). ", 
                "R: A language and environment for statistical computing. ",
                "R Foundation for Statistical Computing, Vienna, Austria. ",
-               "ISBN 3-900051-07-0, URL http://www.R-project.org/.",
+               "URL http://www.R-project.org/.",
                sep=""),
 	       
          mheader = "To cite R in publications use:",
diff --git a/src/library/tools/man/bibstyle.Rd b/src/library/tools/man/bibstyle.Rd
index a5c78fd6448..1c9c60a594f 100644
--- a/src/library/tools/man/bibstyle.Rd
+++ b/src/library/tools/man/bibstyle.Rd
@@ -109,7 +109,6 @@ c(bibentry(bibtype = "manual",
     organization = "R Foundation for Statistical Computing",
     address = "Vienna, Austria",
     year = 2013,
-    isbn = "3-900051-07-0",
     url = "http://www.R-project.org"),
   bibentry(bibtype = "article",
     author = c(person(c("George", "E.", "P."), "Box"),
diff --git a/src/library/utils/man/bibentry.Rd b/src/library/utils/man/bibentry.Rd
index a4a2553061d..865403aeee5 100644
--- a/src/library/utils/man/bibentry.Rd
+++ b/src/library/utils/man/bibentry.Rd
@@ -171,8 +171,7 @@ rref <- bibentry(
    author = person("R Core Team"),
    organization = "R Foundation for Statistical Computing",
    address = "Vienna, Austria",
-   year = 2012,
-   isbn = "3-900051-07-0",
+   year = 2013,
    url = "http://www.R-project.org/")
 
 ## Different printing styles
diff --git a/src/library/utils/man/cite.Rd b/src/library/utils/man/cite.Rd
index abe62172e99..914e914b0fb 100644
--- a/src/library/utils/man/cite.Rd
+++ b/src/library/utils/man/cite.Rd
@@ -101,8 +101,7 @@ rref <- bibentry(
    author = person("R Core Team"),
    organization = "R Foundation for Statistical Computing",
    address = "Vienna, Austria",
-   year = 2012,
-   isbn = "3-900051-07-0",
+   year = 2013,
    url = "http://www.R-project.org/",
    key = "R")
 
diff --git a/src/main/version.c b/src/main/version.c
index bb930564e6f..9c1faf70e0f 100644
--- a/src/main/version.c
+++ b/src/main/version.c
@@ -138,7 +138,7 @@ void attribute_hidden PrintVersion_part_1(char *s)
     }
     SPRINTF_2("\nCopyright (C) %s The R Foundation for Statistical Computing\n",
 	      R_YEAR);
-    strcat(s, "ISBN 3-900051-07-0\n");
+/*  strcat(s, "ISBN 3-900051-07-0\n");  */
     SPRINTF_2("Platform: %s", R_PLATFORM);
     if(strlen(R_ARCH)) { SPRINTF_2("/%s", R_ARCH); }
     SPRINTF_2(" (%d-bit)\n", 8*(int)sizeof(void *));