Aldrich, J. A. (1999). Study guide [to accompany] Introduction to hospitality by John R. Walker (2nd ed.). Prentice Hall.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रAldrich, Jennifer Adams. Study Guide [to Accompany] Introduction to Hospitality by John R. Walker. 2nd ed. Upper Saddle River, N.J: Prentice Hall, 1999.
एमएलए (9वां संस्करण) प्रशस्ति पत्रAldrich, Jennifer Adams. Study Guide [to Accompany] Introduction to Hospitality by John R. Walker. 2nd ed. Prentice Hall, 1999.
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