Translation:There are two libraries in our school.
Hai! I think (at least) the word "kitab" is also used. But, I really do not know in which context one or another is more valid. I think "kitab" can be used for important books or scriptures, but I would use it as a synonym of "buku".
I think this course could accept "buku" and "kitab" as possible translations.
Selamat belajar! :)
I would bet it could be used of religious books. That, at least, would make a great deal of cultural sense. The word "pustaka" is even more interesting to me. There are plenty of Indic words in Indonesian, clearly, but this really has a sort of Srivijaya/Majapahit ring to my entirely untrained ear.