Crumb, C. V. (1970). Training people effectively: The teaching manual for instructors and supervisors in business, education, industry and the professions. Lefax Pub.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रCrumb, Charles V. Training People Effectively: The Teaching Manual for Instructors and Supervisors in Business, Education, Industry and the Professions. Philadelphia, Pa: Lefax Pub, 1970.
एमएलए (9वां संस्करण) प्रशस्ति पत्रCrumb, Charles V. Training People Effectively: The Teaching Manual for Instructors and Supervisors in Business, Education, Industry and the Professions. Lefax Pub, 1970.
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