APA (7 वां संस्करण) प्रशस्ति पत्र
Brookman Stamp Company & Kaufman, L. Brookman 1994: 60 Years as the Nation's Most Accurate and Respected Guide for Retail Stamp Prices.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र
Brookman Stamp Company और Lewis Kaufman. Brookman 1994: 60 Years as the Nation's Most Accurate and Respected Guide for Retail Stamp Prices.
एमएलए (9वां संस्करण) प्रशस्ति पत्र
Brookman Stamp Company और Lewis Kaufman. Brookman 1994: 60 Years as the Nation's Most Accurate and Respected Guide for Retail Stamp Prices.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.