APA (7th ed.) Citation

Cullinan, G. (1973). The United States Postal Service. Praeger.

Chicago Style (17th ed.) Citation

Cullinan, Gerald. The United States Postal Service. New York: Praeger, 1973.

MLA (8th ed.) Citation

Cullinan, Gerald. The United States Postal Service. Praeger, 1973.

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