Creswell, John W., author
Research design : qualitative, quantitative, and mixed methods approaches
Sage, 1994
 Buku Teks
Rosnow, Ralph L., author
Beginning behavioral research : a conceptual primer
Prentice-Hall, 1996
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Foundations for research: methods of inquiry in education and the social sciences
New jersey, 2004
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Neuman, William Lawrence, 1950-, author
Social research methods: qualitative and quantitative approaches
Allyn and Bacon, 1994
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Cozby, Paul C., author
Methods in behavioral research / Paul C. Cozby
McGraw-Hill, 2003
 Buku Teks
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