Wiersma, William
Research methods in education : an introduction
Pearson, 2009
 Buku Teks
Investigating communication: an introduction to research methods
Lawrence R. Frey...[et al.]
Prentice-Hall, 1991
 Buku Teks
Zechmeister, Eugene B.
A practical introduction to research methods in psychology
McGraw-Hill, 1992
 Buku Teks
Alston, Margaret
Research for social workers : an introduction to methods
Allen & Unwin, 1998
 Buku Teks
Research methods in geography: a critical introduction
Basil Gomez and John Paul Jones III, edited
Wiley-Blackwell, 2010
 Buku Teks SO