Παραπομπή APA

Kepner, R. A. (1977). Principles of farm machinery (2.). Avi Publishing company Inc.

Παραπομπή Chicago Style

Kepner, R A. Principles of Farm Machinery. 2. Connecticut: Avi Publishing company Inc, 1977.

Παραπομπή MLA

Kepner, R A. Principles of Farm Machinery. 2. Avi Publishing company Inc, 1977.