APA (7th ed.) Citation

(1946). Letter, Murphy to Riddleberger, April 28, 1946, Secret.

Chicago Style (17th ed.) Citation

Letter, Murphy to Riddleberger, April 28, 1946, Secret. 1946.

MLA (8th ed.) Citation

Letter, Murphy to Riddleberger, April 28, 1946, Secret. 1946.

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