Ely, R. T. (1901). An introduction to political economy (New and rev. ed.). Eaton & Mains; Jennings & Pye.
Lua i Stíl Chicago (17ú heag.)Ely, Richard Theodore. An Introduction to Political Economy. New and rev. ed. New York, Cincinnati: Eaton & Mains; Jennings & Pye, 1901.
Lua MLA (8ú heag.)Ely, Richard Theodore. An Introduction to Political Economy. New and rev. ed. Eaton & Mains; Jennings & Pye, 1901.
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