Virkler, H. A. (1991). Speaking your mind without stepping on toes: Guidelines for group leaders included. Victor.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रVirkler, Henry A. Speaking Your Mind Without Stepping on Toes: Guidelines for Group Leaders Included. New York: Victor, 1991.
एमएलए (9वां संस्करण) प्रशस्ति पत्रVirkler, Henry A. Speaking Your Mind Without Stepping on Toes: Guidelines for Group Leaders Included. Victor, 1991.
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