APA-viite (7. p.)
Friend, G., & Zehle, S. (2004). Guide to business planning. Economist in association with Profile Books.
Chicago-viite (17. p.)
Friend, Graham, ja Stefan Zehle. Guide to Business Planning. London: Economist in association with Profile Books, 2004.
MLA-viite (9. p.)
Friend, Graham, ja Stefan Zehle. Guide to Business Planning. Economist in association with Profile Books, 2004.
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