APA (7th ed.) Citation

Knopp, M. I. (1969). Theory of area. Markham.

Chicago Style (17th ed.) Citation

Knopp, Marvin I. Theory of Area. Chicago: Markham, 1969.

MLA (9th ed.) Citation

Knopp, Marvin I. Theory of Area. Markham, 1969.

Warning: These citations may not always be 100% accurate.