APA (7th ed.) Zitazioa

Friend, G., & Zehle, S. (2004). Guide to business planning. Economist in association with Profile Books.

Chicago Style (17th ed.) Zitazioa

Friend, Graham, eta Stefan Zehle. Guide to Business Planning. London: Economist in association with Profile Books, 2004.

MLA (9th ed.) Zitazioa

Friend, Graham, eta Stefan Zehle. Guide to Business Planning. Economist in association with Profile Books, 2004.