Vockell, Edward L.
Educational research
Macmillan, 1983
Buku Teks SO
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
Buku Teks SO