Risk, T. M. (1958). Principles and practices of teaching in secondary schools (3rd ed.). American Book Co..
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रRisk, Thomas Marion. Principles and Practices of Teaching in Secondary Schools. 3rd ed. N.Y.: American Book Co., 1958.
एमएलए (8वां संस्करण) प्रशस्ति पत्रRisk, Thomas Marion. Principles and Practices of Teaching in Secondary Schools. 3rd ed. American Book Co., 1958.
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