Παραπομπή APA

Shippen, J. M. (1973). Basic farm machinery (2.). Pergamon Press.

Παραπομπή Chicago Style

Shippen, J M. Basic Farm Machinery. 2. Oxford: Pergamon Press, 1973.

Παραπομπή MLA

Shippen, J M. Basic Farm Machinery. 2. Pergamon Press, 1973.