APA (7th ed.) Citation

Thompson, J. D., & Perley, C. W. (1921). Classification. Class Q: Science (3rd edition.). U. S. Government Printing Office.

Chicago Style (17th ed.) Citation

Thompson, James David, and Clarence W. Perley. Classification. Class Q: Science. 3rd edition. Washington: U. S. Government Printing Office, 1921.

MLA (9th ed.) Citation

Thompson, James David, and Clarence W. Perley. Classification. Class Q: Science. 3rd edition. U. S. Government Printing Office, 1921.