Textbooks written by believers.
Prove that evolution is real. Holes? Name one transitional species. For evolution to be real there needs to be millions and millions of transitional species. Name one.
The scientific literature provides thousands of volumes of evidence of the evolutionary processes. Just go to www.pubmed.gov and type "evolution" in the search bar. You will have hundreds of thousands of "hits." Clearly, I cannot condense all of that information here.
As for transitional species, every species alive is one. Shall I start naming them?
--Homo sapiens
--Saccharomyces cerevisiae
--Francisella tularensis
--Xenopus laevis
--Arabidopsis thaliana
--Archaea
I think I've hit every kingdom of organism here. Since there are millions of species, I'm not going to try to name all of them.