Hartley, R.J.
Online searching: principles and practice
Bowker-Saur, 1990
Buku Teks
Systemic practice and action research
Majalah, Jurnal, Buletin
Babbie, Earl
The practice of social research
Wadsworth, 2010
Buku Teks
Steward, Julian H.
Area research: theory and practice
Social Science Research Council, 1950
Buku Teks
Babbie, Earl
The practice of social research
Thomson/Wadsworth, 2004
Buku Teks