Leedy, P. D., & Ormrod, J. E. (2001). Practical research (7th edition.). Upper Saddle River, N.J.: Merrill Prentice Hall.
Trích dẫn kiểu ChicagoLeedy, Paul D., và Jeanne Ellis Ormrod. Practical Research. 7th edition. Upper Saddle River, N.J.: Merrill Prentice Hall, 2001.
Deismireacht MLALeedy, Paul D., và Jeanne Ellis Ormrod. Practical Research. 7th edition. Upper Saddle River, N.J.: Merrill Prentice Hall, 2001.
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