Verika Serbia and other books to be finished by this month

I'm working on some Serb-Croatian type poetry for sale in future. When I stayed in Belgrade, I found a book written by a Czech man and it was in Serbian. Some people would sell poetry books in Serbo-Croat languages. I could say, Serbian and Croatian from the Croat supporting view. And for the Serb supporters, none. NONE!!!!
Why?

We have books like textbooks teaching Srpska language these days!
Why?
I'm supporting northern Bosnia at all.
Enough?

I would add some more Serb poetries here as the memory before Google translate adds Srpska as the choice instead of Serbian...