MLA

Gwin, P.H, and H.F Lionberger. Communication Strategies : a Guide for Agricultural Change Agents. USA, 1982.

APA

Gwin, P., & Lionberger, H. (1982). Communication Strategies : a guide for agricultural change agents. USA.

Chicago

Gwin, P.H., and H.F Lionberger. Communication Strategies : a Guide for Agricultural Change Agents. USA, 1982.