Παραπομπή APA

Friend, G., & Zehle, S. (2004). Guide to business planning. London: The economist in association with Profile Books.

Παραπομπή Chicago Style

Friend, Graham., and Stefan Zehle. Guide to Business Planning. London: The economist in association with Profile Books, 2004.

Παραπομπή MLA

Friend, Graham., and Stefan Zehle. Guide to Business Planning. London: The economist in association with Profile Books, 2004.

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