APA (7e ed.) Bronvermelding

Gregor, H. F. (1970). Geography of agriculture: Theme in research. Prentice - Hall.

Chicago (17e ed.) Bronvermelding

Gregor, Howard F. Geography of Agriculture: Theme in Research. Englewood Cliffs: Prentice - Hall, 1970.

MLA (9e ed.) Bronvermelding

Gregor, Howard F. Geography of Agriculture: Theme in Research. Prentice - Hall, 1970.

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