Nexsen, 1891, p. 98. Nexsen, John A. (1891). "The 1804 Dollar". American Journal of Numismatics. XXV. Boston, Massachusetts: Boston Numismatic Society.
Nexsen, 1905, p. 102. Nexsen, John A. (1905). "The 1804 Dollar". American Journal of Numismatics. XXXIX. Boston, Massachusetts: Boston Numismatic Society.