Cita APA (7a ed.)
Scott Publishing Co, Snee, C., Kloetzel, J. E., & Houseman, D. Specialized Catalogue of United States Stamps and Covers: 2015 (Nonagésima tercera edición.).
Cita Chicago Style (17a ed.)
Scott Publishing Co, Charles Snee, James E. Kloetzel, y Donna Houseman. Specialized Catalogue of United States Stamps and Covers: 2015. Nonagésima tercera edición.
Cita MLA (9a ed.)
Scott Publishing Co, et al. Specialized Catalogue of United States Stamps and Covers: 2015. Nonagésima tercera edición.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.