APA-referens (7:e uppl.)
Brookman Stamp Company & Kaufman, L. Brookman 1994: 60 Years as the Nation's Most Accurate and Respected Guide for Retail Stamp Prices.
Chicago-referens (17:e uppl.)
Brookman Stamp Company och Lewis Kaufman. Brookman 1994: 60 Years as the Nation's Most Accurate and Respected Guide for Retail Stamp Prices.
MLA-referens (9:e uppl.)
Brookman Stamp Company och Lewis Kaufman. Brookman 1994: 60 Years as the Nation's Most Accurate and Respected Guide for Retail Stamp Prices.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.