Is it possible to create a citation style for custom books?
No - we can only select citation styles from those included in the software
Thank you!
As Graham said, we can't create citation styles. I'm stumbling over your "custom books". The citation styles work for all books equally (there may be master data errors or bugs, but in principle that's the case).
Why are you asking for "custom books" - do you mean Personal Books? The citation styles work for them as well, the point is to include the necessary data when building the book (such as publishing year, publisher with location etc)
When referring to “books”, my purpose was just to differentiate from quotations of biblical passages!