Thread: "Some of the ISBNs you entered were invalid..."
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Old 05-19-2019, 03:15 AM   #4
pdurrant
The Grand Mouse 高貴的老鼠
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Quote:
Originally Posted by DNSB View Post
According to ISBN-10 & -13 check digit calculators and entering the first 9 digits (without spaces or any other separators, the check digit should be 8 not 4 for that ISBN. A quick check says this is the Cambridge University Press paperback version which shows 9780521349185 as the ISBN-13 which verifies.
The error isn't in the check digit, but in the ISBN itself. It should be 0521349184

note the ...491... not ...481...
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