APA (7th ed.) Citation

HBO Home Entertainment (Firm), March of Time, Inc, & Van Voorhis, W. (1948). Watchdogs of the mail. Home Box Office.

Chicago Style (17th ed.) Citation

HBO Home Entertainment (Firm), Inc March of Time, and Westbrook Van Voorhis. Watchdogs of the Mail. New York, NY: Home Box Office, 1948.

MLA (9th ed.) Citation

HBO Home Entertainment (Firm), et al. Watchdogs of the Mail. Home Box Office, 1948.