Gaya APA

Shenson, H, L. (1990). How To Develop dan Promote : The Definitive Guide To Creating And Marketing Seminars, Workshops, Classes and Conferences . America: John Wiley & Sons.

Gaya MLA

Shenson, Howard, L. "How To Develop dan Promote : The Definitive Guide To Creating And Marketing Seminars, Workshops, Classes and Conferences". America: John Wiley & Sons, 1990. Text.