Curtis, S. (1976). Exploring occupations in agribusiness and natural sciences. McGraw-Hill, Inc.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रCurtis, Samuel. Exploring Occupations in Agribusiness and Natural Sciences. New York: McGraw-Hill, Inc, 1976.
एमएलए (9वां संस्करण) प्रशस्ति पत्रCurtis, Samuel. Exploring Occupations in Agribusiness and Natural Sciences. McGraw-Hill, Inc, 1976.
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