Kranzberg, M., & Gies, J. (1975). By the sweat of thy brow: Work in the Western world. Putnam.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रKranzberg, Melvin, और Joseph Gies. By the Sweat of Thy Brow: Work in the Western World. New York: Putnam, 1975.
एमएलए (9वां संस्करण) प्रशस्ति पत्रKranzberg, Melvin, और Joseph Gies. By the Sweat of Thy Brow: Work in the Western World. Putnam, 1975.
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