Saunders, Mark, author
Research methods for business students
Pearson Education, 2016
 Buku Teks
Saunders, Mark, author
Research methods for business students
Prentice-Hall, 2003
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Wiersma, William, author
Research methods in education: an introduction
Pearson/Allyn and Bacon, 2005
 Buku Teks
Wiersma, William, author
Research methods in education : an introduction
Pearson, 2009
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Barker, Chris, author
Research methods in clinical and counselling psychology
John Wiley and Sons, 1994
 Buku Teks