APA-referens (7:e uppl.)

Não informado. Agricultural research results. Science and Education Administration.

Chicago-referens (17:e uppl.)

Não informado. Agricultural Research Results. Berkeley, Calif: Science and Education Administration.

MLA-referens (8:e uppl.)

Não informado. Agricultural Research Results. Science and Education Administration.

Varning: dessa hänvisningar är inte alltid fullständigt riktiga.