Cita APA (7a ed.)
Irvine, D. E. G., & Seshold, M. Errors in Postage Stamp Design.
Cita Chicago Style (17a ed.)
Irvine, David E. G., y Maxwell Seshold. Errors in Postage Stamp Design.
Cita MLA (9a ed.)
Irvine, David E. G., y Maxwell Seshold. Errors in Postage Stamp Design.
警告：這些引文格式不一定是100％准確.