Cita APA (7a ed.)
Mackay, J. D. The Complete Guide to Stamps and Stamp Collecting.
Cita Chicago Style (17a ed.)
Mackay, James Dr. The Complete Guide to Stamps and Stamp Collecting.
Cita MLA (9a ed.)
Mackay, James Dr. The Complete Guide to Stamps and Stamp Collecting.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.