APA استشهاد

AHLGREN,Gilbert H. (1956). FORAGE CROPS (2.). McGRAW-HILL BOOK COMPANY,INC.

استشهاد بنمط شيكاغو

AHLGREN,Gilbert H. FORAGE CROPS. 2. NEW YORK: McGRAW-HILL BOOK COMPANY,INC, 1956.

MLA استشهاد

AHLGREN,Gilbert H. FORAGE CROPS. 2. McGRAW-HILL BOOK COMPANY,INC, 1956.