Cita APA (7a ed.)
Stanley Gibbons Publications Ltd & Stanley Gibbons. Collect British Stamps: A Stanley Gibbons Checklist of the Stamps of Great Britain (Primera edición.).
Cita Chicago Style (17a ed.)
Stanley Gibbons Publications Ltd y Stanley Gibbons. Collect British Stamps: A Stanley Gibbons Checklist of the Stamps of Great Britain. Primera edición.
Cita MLA (9a ed.)
Stanley Gibbons Publications Ltd y Stanley Gibbons. Collect British Stamps: A Stanley Gibbons Checklist of the Stamps of Great Britain. Primera edición.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.