Radeker,第1740頁. Radeker, William T. Those Collectable 2-Cent Pieces. The Numismatist (Colorado Springs, CO: American Numismatic Association). 1991-11: 1739–1741, 1805. ISSN 0029-6090.
Kay,第40頁. Kay, Rick. The Remarkable Coinage of James B. Longacre. The Numismatist (Colorado Springs, CO: American Numismatic Association). 2005-04: 36–37, 40–41. ISSN 0029-6090.
Radeker,第1741頁. Radeker, William T. Those Collectable 2-Cent Pieces. The Numismatist (Colorado Springs, CO: American Numismatic Association). 1991-11: 1739–1741, 1805. ISSN 0029-6090.
Bureau of the Mint,第44–45頁. Bureau of the Mint. Laws of the United States Relating to the Coinage. Washington, D.C.: United States Government Printing Office. 1904. OCLC 8109299.
Bureau of the Mint,第48頁. Bureau of the Mint. Laws of the United States Relating to the Coinage. Washington, D.C.: United States Government Printing Office. 1904. OCLC 8109299.
Bureau of the Mint,第46頁. Bureau of the Mint. Laws of the United States Relating to the Coinage. Washington, D.C.: United States Government Printing Office. 1904. OCLC 8109299.
Bureau of the Mint,第50頁. Bureau of the Mint. Laws of the United States Relating to the Coinage. Washington, D.C.: United States Government Printing Office. 1904. OCLC 8109299.
Freeman,第562–563頁. Freeman, S.W. Two Cent Pieces of the United States. The Numismatist (Colorado Springs, CO: American Numismatic Association). 1954-06: 562–573. ISSN 0029-6090.
White,第37頁. White, Jack. The Two Cent Piece. Coins (Iola, WI: Krause Publications). 1971-05: 37. ISSN 0010-0471.