Cita APA

Vatican Philatelic Society, Ufficio Philatelico e Numismatico, & Etchingham, J. Vatican stamp collection.

Citación estilo Chicago

Vatican Philatelic Society, Ufficio Philatelico e Numismatico, and John Etchingham. Vatican Stamp Collection.

Cita MLA

Vatican Philatelic Society, et al. Vatican Stamp Collection.