Cita APA (7th ed.)
U.S. Postal Service & U.S. Postal Service. Wildlife America: A collection of U.S. Commemorative Stamps.
Cita Chicago (17th ed.)
U.S. Postal Service i U.S. Postal Service. Wildlife America: A Collection of U.S. Commemorative Stamps.
Cita MLA (9th ed.)
U.S. Postal Service i U.S. Postal Service. Wildlife America: A Collection of U.S. Commemorative Stamps.
Atenció: Aquestes cites poden no estar 100% correctes.