Add book as series to existing book

[Kahveci]

Hi all!

I tried to add the book in this link as a 2-volume edition, but I couldn't:
https://www.goodreads.com/book/show/5...

The details of the edition I want to add can be found here:
https://www.sehadetkitap.com/urun/el-...

I would appreciate your help.

[Martin]

It is already listed https://www.goodreads.com/book/show/1...

[Kahveci]

Actually, it's two books, but they've been listed as a single one

[Martin]

Do they have different ISBNs?

[Kahveci]

i don't know it

[Martin]

If they have just one ISBN and are sold as a set the current listing is correct.
If you don't know it is best to leave things as they are.

[Kahveci]

thanks for the info