APA (7e ed.) Bronvermelding

ROYEN, W. V., & BENGTSON, N. A. (1964). Fundamentals of economic geography: An introduction tothe study of resources. Prentice-Hall.

Chicago (17e ed.) Bronvermelding

ROYEN, William Van, en Nels A. BENGTSON. Fundamentals of Economic Geography: An Introduction Tothe Study of Resources. Englewood Cliffs: Prentice-Hall, 1964.

MLA (9e ed.) Bronvermelding

ROYEN, William Van, en Nels A. BENGTSON. Fundamentals of Economic Geography: An Introduction Tothe Study of Resources. Prentice-Hall, 1964.