Kepner, R. A. (1977). Principles of farm machinery (2.). Avi Publishing company Inc.
Čikaški stil citiranjaKepner, R A. Principles of Farm Machinery. 2. Connecticut: Avi Publishing company Inc, 1977.
MLA način citiranjaKepner, R A. Principles of Farm Machinery. 2. Avi Publishing company Inc, 1977.
Upozorenje: Ovi citati možda nisu uvijek 100% točni.