APA (7th ed.) Citation

Smithsonian Institution. (1919). Catalogue of postage stamps and stamped envelopes of U.S. and possessions, issued prior to Jan. 1, 1919. GPO.

Chicago Style (17th ed.) Citation

Smithsonian Institution. Catalogue of Postage Stamps and Stamped Envelopes of U.S. and Possessions, Issued Prior to Jan. 1, 1919. [Washington]: GPO, 1919.

MLA (9th ed.) Citation

Smithsonian Institution. Catalogue of Postage Stamps and Stamped Envelopes of U.S. and Possessions, Issued Prior to Jan. 1, 1919. GPO, 1919.