APA (7th ed.) Citation

Richard M. Calkins: Richard M. Calkins (U.S.A.). 1981.

Chicago Style (17th ed.) Citation

Richard M. Calkins: Richard M. Calkins. U.S.A. Dow Jones Irwin Publication: 1981.

MLA (9th ed.) Citation

Richard M. Calkins: Richard M. Calkins. U.S.A. 1981.

Warning: These citations may not always be 100% accurate.