User talk:Dirk P Broer

References

Copy edit from CR.42: "Both the Mushroom book itself and Amazon.cu.uk also list the two ISBN nrs. ISBN-13 is supposed to replace the normal ISBN in the near future.Dirk P Broer 14:30, 5 May 2007 (UTC)"[reply]

With the majority of published works from 1966-2007 only listing an ISBN (the so-called 10 protocol), you would only be able to find the ISBN -13 on published works from 1 January 2007 (some earlier editions also supplied the number), but it would not be counter-productive to list both. Again, in citations and bibliographical referencing, noting the ISBN is merely an optional note as it has more to do with locating the item in a bookseller's directory and really does not fall into a reference tracing. Most researched works prior to the 2000s, rarely identified the ISBN, it is now added (in practice) but there is no real need for it in a bibliographical record. IMHO User:Bzuk:Bzuk 15:51, 5 May 2007 (UTC).[reply]