Cita APA (7a ed.)
Scott Publishing Co. Stamps and Stories: The encyclopedia of U.S. Stamps (Séptima edición.).
Cita Chicago Style (17a ed.)
Scott Publishing Co. Stamps and Stories: The Encyclopedia of U.S. Stamps. Séptima edición.
Cita MLA (9a ed.)
Scott Publishing Co. Stamps and Stories: The Encyclopedia of U.S. Stamps. Séptima edición.
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