APA (7th ed.) Zitazioa
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.).
Chicago Style (17th ed.) Zitazioa
The Airpost Journal, George W. Angers, Walter J. Conrath, eta L. B. Gatchell. American Air Mail Catalogue: Reference Listing of the Airposts of the World. Primera edición.
MLA (9th ed.) Zitazioa
The Airpost Journal, et al. American Air Mail Catalogue: Reference Listing of the Airposts of the World. Primera edición.
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