Cita APA (7a 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 Style (17a ed.)
The Airpost Journal, George W. Angers, Walter J. Conrath, y L. B. Gatchell. American Air Mail Catalogue: Reference Listing of the Airposts of the World. Primera edición.
Cita MLA (9a ed.)
The Airpost Journal, et al. American Air Mail Catalogue: Reference Listing of the Airposts of the World. Primera edición.
警告：這些引文格式不一定是100％准確.