APA (7th ed.) Citation

United States. Postmaster General. (1931). Increased postage on letters and post cards to Bahamas, Barbados, Bermuda, British Guiana, British Honduras, Jamaica, Leeward Islands, Netherlands (Dutch), West Indies, New Zealand, Trinidad, and Windward Islands. U.S. GPO.

Chicago Style (17th ed.) Citation

United States. Postmaster General. Increased Postage on Letters and Post Cards to Bahamas, Barbados, Bermuda, British Guiana, British Honduras, Jamaica, Leeward Islands, Netherlands (Dutch), West Indies, New Zealand, Trinidad, and Windward Islands. Washington: U.S. GPO, 1931.

MLA (9th ed.) Citation

United States. Postmaster General. Increased Postage on Letters and Post Cards to Bahamas, Barbados, Bermuda, British Guiana, British Honduras, Jamaica, Leeward Islands, Netherlands (Dutch), West Indies, New Zealand, Trinidad, and Windward Islands. U.S. GPO, 1931.