APA

Riegel R. E., Eager W. L. & Merrill F. E. (1941). An introduction to the social sciences. New York: D. Appleton-Century Company, Incorporated.

Chicago

Riegel Robert E, Eager William Lawrence and Merrill Francis Ellsworth. 1941. An introduction to the social sciences. New York: D. Appleton-Century Company, Incorporated.

Harvard

Riegel R. E., Eager W. L. and Merrill F. E. (1941). An introduction to the social sciences. New York: D. Appleton-Century Company, Incorporated.

MLA

Riegel Robert E, Eager William Lawrence and Merrill Francis Ellsworth. An introduction to the social sciences. New York: D. Appleton-Century Company, Incorporated. 1941.