Pretzer 1985, p. 7. Pretzer, William S. (1985). "The British, Duff Green, the Rats and the Devil: Custom, Capitalism, and Conflict in the Washington Printing Trade, 1834–36". Labor History. 27 (1): 5–30. doi:10.1080/00236568508584824.
Pretzer 1985, pp. 13–21. Pretzer, William S. (1985). "The British, Duff Green, the Rats and the Devil: Custom, Capitalism, and Conflict in the Washington Printing Trade, 1834–36". Labor History. 27 (1): 5–30. doi:10.1080/00236568508584824.