Leedy, P. D. (2001). Practical research: Planning and design. Merrill Prentice Hall.
Trích dẫn kiểu ChicagoLeedy, Paul D. Practical Research: Planning and Design. Merrill Prentice Hall, 2001.
ציטוט MLALeedy, Paul D. Practical Research: Planning and Design. Merrill Prentice Hall, 2001.
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