APA (7th ed.) Citation

(1930). Postal bulletin, Jan. 23, 1939. [s.n.].

Chicago Style (17th ed.) Citation

Postal Bulletin, Jan. 23, 1939. [Washington]: [s.n.], 1930.

MLA (9th ed.) Citation

Postal Bulletin, Jan. 23, 1939. [s.n.], 1930.

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