Cita APA (7a ed.)
Minkus New World-Wide Postage Stamp Catalog: 1969.
Cita Chicago Style (17a ed.)
Minkus New World-Wide Postage Stamp Catalog: 1969.
Cita MLA (9a ed.)
Minkus New World-Wide Postage Stamp Catalog: 1969.
Advarsel: Disse citationer er muligvist ikke 100% nøjagtige.