Παραπομπή APA

Gilbert H Ahlgren. (1956). Forage crops (2.). Mc Graw Hill Book company Inc.

Παραπομπή Chicago Style

Gilbert H Ahlgren. Forage Crops. 2. Mc Graw Hill Book company Inc, 1956.

Παραπομπή MLA

Gilbert H Ahlgren. Forage Crops. 2. Mc Graw Hill Book company Inc, 1956.