APA-referens

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

Chicago-stil citat

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

MLA-referens

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