Vockell, Edward L.
Educational research
Macmillan, 1983
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Saiyidain, K.G.
Iqbal's educational philosophy
Shaikh Muhammad Ashraf, 1954
Buku Teks SO
Marczyk, Geoffrey
Essentials of research design and methodology
John Wiley & Sons, 2005
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The Methodology of comparative research
edited by Robert T. Holt
Free Press, 1970
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Methodology in social research
McGraw-Hill, 1971
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