Ultimate Reference for book info

[Sandy]

Newbie Librarian here.

Just wondering which reference I should use if details on a book (using both ISBN 10 and ISBN 13) are not consistent across a number of references?

I've noticed for a few books, the details found on the actual publisher website differs from WorldCat which again differs from Amazon.

Thanks in advance.

[lethe]

Depends what sort of info. Best is of course book in hand, but failing that, Worldcat is the most trustworthy for page count.