APA (7th ed.) Citation

Kiwi, M. L., & Riesenfeld, F. Letter.

Chicago Style (17th ed.) Citation

Kiwi, Max L., and Fritz Riesenfeld. Letter.

MLA (8th ed.) Citation

Kiwi, Max L., and Fritz Riesenfeld. Letter.

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