Thread:Gsimenas/@comment-24233624-20160604224322/@comment-6697950-20160605061948

I don't get your first question... If you meant how to add it, just copy paste it where it's needed and write ISBN in front. It will automatically become a link. Just look at existing examples if you're not sure about something.

As for finding it, Amazon is probably the best site to find any ISBN. You can also use Dengeki sites for JP volumes and Hachette's site for Yen Press translations.