APA-Zitierstil (7. Ausg.)

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

Chicago-Zitierstil (17. Ausg.)

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

MLA-Zitierstil (9. Ausg.)

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