Cita APA (7a ed.)
Stanley Gibbons Publications Ltd & Mackay, J. A. Philatelic Terms Illustrated.
Cita Chicago Style (17a ed.)
Stanley Gibbons Publications Ltd y James A. Mackay. Philatelic Terms Illustrated.
Cita MLA (9a ed.)
Stanley Gibbons Publications Ltd y James A. Mackay. Philatelic Terms Illustrated.
警告：這些引文格式不一定是100％准確.