Tohutoro APA (7th ed.)
O'Brien, G. (2001). An Essay on mediæval economic teaching. Batoche.
Tohutoru Kātū Chicago (17th ed.)
O'Brien, George. An Essay on Mediæval Economic Teaching. Kitchener, Ont.: Batoche, 2001.
Tohutoro MLA (9th ed.)
O'Brien, George. An Essay on Mediæval Economic Teaching. Batoche, 2001.
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