Writing Research Paper on Starting a Photography Business. Any Good Books to Buy?

so for my research writing class, i will be writing a research paper on how to start a photography business. are there any recommended books that i should buy, that tells me how to start it?

here are some facts/experience about me:

ive been doing photography since nov 2006.
ive gone through various lenses and switched through to 3 different bodies.
ive done a few gigs: most are pre-prom sessions.
funny thing: my friend and i have somewhat started a photography business but we aren't too prepared..so this research will help me in two ways: get the grade necessary for the class and learn about how to start the business.

If I were teaching you I would only allow primary research.

i wouldnt mind asking photographers how much they charge and gather an average, but i dont know if they would release that information to me if im just using it as a research idea. BUT anyone who reads this is more than welcomed to PM me a pricing.