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.).
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Chicago-čujuhus (17. p.)
The Airpost Journal, George W. Angers, Walter J. Conrath, juo L. B. Gatchell. American Air Mail Catalogue: Reference Listing of the Airposts of the World. Primera edición.
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MLA-čujuhus (9. p.)
The Airpost Journal, et al. American Air Mail Catalogue: Reference Listing of the Airposts of the World. Primera edición.
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