Cita APA (7th ed.)
The Airpost Journal, Angers, G. W., Conrath, W. J., & Gatchell, L. B. American Air Mail Catalogue: Reference Listing of the Airposts of the World (Primera edición.).
Cita Chicago (17th ed.)
The Airpost Journal, George W. Angers, Walter J. Conrath, i L. B. Gatchell. American Air Mail Catalogue: Reference Listing of the Airposts of the World. Primera edición.
Cita MLA (9th ed.)
The Airpost Journal, et al. American Air Mail Catalogue: Reference Listing of the Airposts of the World. Primera edición.
Atenció: Aquestes cites poden no estar 100% correctes.