Cita APA (7th ed.)
Mackay, J. D. The Complete Guide to Stamps and Stamp Collecting.
Cita Chicago (17th ed.)
Mackay, James Dr. The Complete Guide to Stamps and Stamp Collecting.
Cita MLA (9th ed.)
Mackay, James Dr. The Complete Guide to Stamps and Stamp Collecting.
Atenció: Aquestes cites poden no estar 100% correctes.