«Coin Collecting». britannica.com]. Վերցված է 2010 թ․ դեկտեմբերի 14-ին. Quote: "The Nestorian scholars and artisans who served the princes of the Jazira (Mesopotamia, now Iraq, Syria, and Turkey) in the 12th and 13th centuries designed a magnificent series of coins with motifs based on ancient Greek and Roman issues. Some of these so accurately render the details of the originals that even the inscriptions are faithfully repeated. Others were modified in intriguing ways. [...] The great variety and the sophisticated use of these images reveal the existence of well-studied collections."
«Coin Collecting». Britannica Online. britannica.com. Վերցված է 2009 թ․ օգոստոսի 26-ին.
Hall, David. «The Eliasberg Collection». PCGS - The Professional Coin Grading Service. Վերցված է 2013 թ․ հոկտեմբերի 14-ին. «His goal was to assemble a complete collection of United States regular issue coins, of every date, metal, denomination, and mint mark known to collectors at the time. He accomplished this monumental feat by 1950, by purchasing the last gold coin he needed (1841 $2 1/2) in 1949 and the last silver coin he needed (1873-CC no arrows dime) in 1950.»
