APA (7th ed.) Zitazioa
Koester, E. (2011). Green entrepreneur handbook: The guide to building and growing a green and clean business. CRC Press LLC.
Chicago Style (17th ed.) Zitazioa
Koester, Eric. Green Entrepreneur Handbook: The Guide to Building and Growing a Green and Clean Business. Boca Raton, FL: CRC Press LLC, 2011.
MLA (9th ed.) Zitazioa
Koester, Eric. Green Entrepreneur Handbook: The Guide to Building and Growing a Green and Clean Business. CRC Press LLC, 2011.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.