APA (7th ed.) Citation

Huntington, E., & Cushing, S. W. (1921). Principles of human geography. John Wiley & sons, inc.; [etc., etc.].

Chicago Style (17th ed.) Citation

Huntington, Ellsworth, and Sumner W. Cushing. Principles of Human Geography. New York: John Wiley & sons, inc.; [etc., etc.], 1921.

MLA (9th ed.) Citation

Huntington, Ellsworth, and Sumner W. Cushing. Principles of Human Geography. John Wiley & sons, inc.; [etc., etc.], 1921.