Gumpert, D. E. (1990). Guide to Creating a Successful Business Plan: Featuring the Business Plans of Pizza Hut, People... MA: Goldhirsh Group.
استشهاد بنمط شيكاغوGumpert, David E. Guide to Creating a Successful Business Plan: Featuring the Business Plans of Pizza Hut, People... MA: Goldhirsh Group, 1990.
MLA استشهادGumpert, David E. Guide to Creating a Successful Business Plan: Featuring the Business Plans of Pizza Hut, People... MA: Goldhirsh Group, 1990.
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