Ramsoy, O. 1. (1963). Social groups as system and subsystem ([1st American ed.].). Free Press of Glencoe.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रRamsoy, Odd 1924. Social Groups as System and Subsystem. [1st American ed.]. New York: Free Press of Glencoe, 1963.
एमएलए (9वां संस्करण) प्रशस्ति पत्रRamsoy, Odd 1924. Social Groups as System and Subsystem. [1st American ed.]. Free Press of Glencoe, 1963.
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