Παραπομπή σε μορφή APA (7η εκδ.)

Bengtson, N. A., & Van Royen, W. (1964). Fundamentals of economic geography: An introduction to the study of resources. Prentice-Hall.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Bengtson, N. A., και William Van Royen. Fundamentals of Economic Geography: An Introduction to the Study of Resources. Englewood Cliffs, NJ: Prentice-Hall, 1964.

Παραπομπή σε μορφή MLA (9th εκδ.)

Bengtson, N. A., και William Van Royen. Fundamentals of Economic Geography: An Introduction to the Study of Resources. Prentice-Hall, 1964.