APA (7e ed.) Bronvermelding

Não informado. (1945). Down to earth: A review of agricultural chemical progress. Down Chemical, Agricultural Products Department.

Chicago (17e ed.) Bronvermelding

Não informado. Down to Earth: A Review of Agricultural Chemical Progress. Midland, Mich: Down Chemical, Agricultural Products Department, 1945.

MLA (8e ed.) Bronvermelding

Não informado. Down to Earth: A Review of Agricultural Chemical Progress. Down Chemical, Agricultural Products Department, 1945.

Let op: Deze citaties zijn niet altijd 100% accuraat.