Philatelic Society [Compiler]. The postage stamps, envelopes, wrappers and post cards of the North American colonies of Great Britain.
Chicago-referens (17:e uppl.)Philatelic Society [Compiler]. The Postage Stamps, Envelopes, Wrappers and Post Cards of the North American Colonies of Great Britain.
MLA-referens (9:e uppl.)Philatelic Society [Compiler]. The Postage Stamps, Envelopes, Wrappers and Post Cards of the North American Colonies of Great Britain.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.