APA

Bengtson N. A., Van Royen W., . (1947). Fundamentals of economic geography. New York: Prentice-Hall, Inc.

Chicago

Bengtson N A, Van Royen William, . 1947. Fundamentals of economic geography. New York: Prentice-Hall, Inc.

Harvard

Bengtson N. A., Van Royen W., . (1947). Fundamentals of economic geography. New York: Prentice-Hall, Inc.

MLA

Bengtson N A, Van Royen William, . Fundamentals of economic geography. New York: Prentice-Hall, Inc. 1947.