APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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