Dyfyniad APA

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

Dyfyniad Arddull Chicago

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

Dyfyniad MLA

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

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.