Talk:International Standard Book Number

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Bug in ISBN-13 check digit calculation example[edit]

The "ISBN-13 check digit calculation" section includes an example with:

For example, the ISBN-13 check digit of 978-0-306-40615-? is calculated as follows:

s = 9×1 + 7×3 + 8×1 + 0×3 + 3×1 + 0×3 + 6×1 + 4×3 + 0×1 + 6×3 + 1×1 + 5×3
  =   9 +  21 +   8 +   0 +   3 +   0 +   6 +  12 +   0 +  18 +   1 +  15
  = 93
93 / 10 = 9 remainder 3
10 –  3 = 7

That's fine for 978-0-306-40615-? but if the number had been 978-0-306-40614-? we would have:

s = 9×1 + 7×3 + 8×1 + 0×3 + 3×1 + 0×3 + 6×1 + 4×3 + 0×1 + 6×3 + 1×1 + 4×3
  =   9 +  21 +   8 +   0 +   3 +   0 +   6 +  12 +   0 +  18 +   1 +  12
  = 90
90 / 10 = 9 remainder 0
10 –  0 = 10

I highlighted the part that changes so that you can see what's different.

The issue is that computed check digit is "10". We need to do another mod 10 on it but I'm not sure of the best way to show this. For example: we could do it all in one line:

  = 90
(10 - (90 mod 10)) mod 10 = 0

Or would it be easier to understand if it broken down to more than one line?

  = 90
(10 - (90 mod 10)) = 10
10 mod 10 = 0

An issue with the proposed fixed is that in the #ISBN-10 check digit calculation talk section which is above this there's talk about avoiding modular arithmetic in the examples. --Marc Kupper|talk 06:51, 20 March 2016 (UTC)

Bar Code Explanation[edit]

In the second figure there is an explanation to the numbers:

ISBN-10: Group, Publisher, Title, Control digits

ISBN-13: EAN, Group, Publisher, Title, Control digits

But "Title" is misleading. One title can have many ISBNs, and one ISBN can cover a lot of titles in one series.

A better explanation would be "Publication(s)". Benadikt (talk) 09:27, 30 September 2016 (UTC)

Faulty ISBN[edit]

There may be better places to ask this question, but I thought I'd start here.

Oliver Harris, The Archbishops' Town: the making of medieval Croydon is a booklet published by the Croydon Natural History and Scientific Society in 2005. It technically forms part of the Society's Proceedings (journal), and has an ISSN, but that's not the point at issue here: it was also published as a stand-alone "book", and so has an ISBN. I have a copy, and the ISBN printed in it (twice) is 0-906047-20-4; and that number appears to have been accepted by at least three library catalogues, including the British Library. The book is cited in at least two wikipedia articles (Croydon and Croydon Minster). However, when I attempt to add the ISBN to the "cite book" template, a "checksum" error message appears. I haven't attempted to check the arithmetic, but I assume that the number was misprinted in the book (the publisher is obviously a small local society, and mistakes do happen). Other publications from the same publisher have the same 0-906047 elements: the error would therefore appear to lie in the final three digits, representing the publication number and check digit. My question, therefore, is: is there some simple way I can work out what the ISBN should be – either from some central database, or by trying to work backwards from the incorrect number I do have? And, if I can establish the correct number, is it a useful detail to aid readers wanting to track the book down, given that it's not what the book itself says? GrindtXX (talk) 16:45, 11 October 2016 (UTC)

@GrindtXX: This is off-topic, as this talk page is intended for discussing improvements to the article International Standard Book Number. A better venue for questions like this would be WT:ISBN. But for your example, if the first 9 digits be unchanged, the check digit should be X, as in ISBN 0-906047-20-X and this is confirmed by Amazon. --Redrose64 (talk) 23:01, 11 October 2016 (UTC)
Thanks. That does appear to resolve the issue, and I will add the ISBN in that form. GrindtXX (talk) 00:41, 12 October 2016 (UTC)