APA (7th ed.) Citation
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.) Citation
The Airpost Journal, George W. Angers, Walter J. Conrath, and L. B. Gatchell. American Air Mail Catalogue: Reference Listing of the Airposts of the World. Primera edición.
MLA (9th ed.) Citation
The Airpost Journal, et al. American Air Mail Catalogue: Reference Listing of the Airposts of the World. Primera edición.
Warning: These citations may not always be 100% accurate.