Cita APA (7a ed.)
Stanley Gibbons Publications Ltd & Allen, E. Collect British Stamps: A Stanley Gibbons Checklist of the Stamps of Great Britain (Vigésima edición.).
Cita Chicago Style (17a ed.)
Stanley Gibbons Publications Ltd y Eric Allen. Collect British Stamps: A Stanley Gibbons Checklist of the Stamps of Great Britain. Vigésima edición.
Cita MLA (9a ed.)
Stanley Gibbons Publications Ltd y Eric Allen. Collect British Stamps: A Stanley Gibbons Checklist of the Stamps of Great Britain. Vigésima edición.
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