Allen, E. M. (1930). America's story as told in postage stamps. Whittlesey House.
Citazione stile Chigago Style (17a edizione)Allen, Edward Monington. America's Story as Told in Postage Stamps. New York: Whittlesey House, 1930.
Citatione MLA (9a ed.)Allen, Edward Monington. America's Story as Told in Postage Stamps. Whittlesey House, 1930.
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