APA (7 वां संस्करण) प्रशस्ति पत्र
Johnston, R. D. (2006). The radical middle class: Populist democracy and the question of capitalism in progressive era Portland, Oregon. Princeton University Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र
Johnston, Robert D. The Radical Middle Class: Populist Democracy and the Question of Capitalism in Progressive Era Portland, Oregon. Princeton, New Jersey ; Oxfordshire, England: Princeton University Press, 2006.
एमएलए (9वां संस्करण) प्रशस्ति पत्र
Johnston, Robert D. The Radical Middle Class: Populist Democracy and the Question of Capitalism in Progressive Era Portland, Oregon. Princeton University Press, 2006.
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