Cita APA (7th 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 (17th ed.)
Scott Publishing Co, Charles Snee, James E. Kloetzel, i Donna Houseman. Specialized Catalogue of United States Stamps and Covers: 2015. Nonagésima tercera edición.
Cita MLA (9th ed.)
Scott Publishing Co, et al. Specialized Catalogue of United States Stamps and Covers: 2015. Nonagésima tercera edición.
Atenció: Aquestes cites poden no estar 100% correctes.