Frey, L. R. (1991). Investigating communication: An introduction to research methods. Prentice Hall.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रFrey, Lawrence R. Investigating Communication: An Introduction to Research Methods. Englewood Cliffs, N.J: Prentice Hall, 1991.
एमएलए (9वां संस्करण) प्रशस्ति पत्रFrey, Lawrence R. Investigating Communication: An Introduction to Research Methods. Prentice Hall, 1991.
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