Swope, G. 1., & Frederick, J. G. (1931). The Swope plan, details, criticism, analysis: Plan by Gerald Swope. The Business Course.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रSwope, Gerald 1872, और J George Frederick. The Swope Plan, Details, Criticism, Analysis: Plan by Gerald Swope. New York: The Business Course, 1931.
एमएलए (9वां संस्करण) प्रशस्ति पत्रSwope, Gerald 1872, और J George Frederick. The Swope Plan, Details, Criticism, Analysis: Plan by Gerald Swope. The Business Course, 1931.
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