APA (7th ed.) Citation

United States. Post Office Department. (1940). Schedule of Steamships Carrying Mails from the United States and United States Mails from Habana, Cuba, to Foreign Countries, Also to the Territory of Hawaii and to Possessions of the United States, May 1940. [publisher not identified].

Chicago Style (17th ed.) Citation

United States. Post Office Department. Schedule of Steamships Carrying Mails from the United States and United States Mails from Habana, Cuba, to Foreign Countries, Also to the Territory of Hawaii and to Possessions of the United States, May 1940. [Washington]: [publisher not identified], 1940.

MLA (9th ed.) Citation

United States. Post Office Department. Schedule of Steamships Carrying Mails from the United States and United States Mails from Habana, Cuba, to Foreign Countries, Also to the Territory of Hawaii and to Possessions of the United States, May 1940. [publisher not identified], 1940.