Lee, Raymond M.
Unobtrusive methods in social research
Open University Press, 2000
 Buku Teks SO
Methodology of social science research
edited by Sugata Dasgupta
Impex India, 1967
 Buku Teks SO
Kidder, Louis H.
Research methods in social relations
Holt, Rinehart and Winston, 1981
 Buku Teks SO
Judd, Charles M.
Research methods in social relations
Harcout Brace Jovanovich College Publishers, 1991
 Buku Teks SO
Marshall, Catherine
Designing qualitative research
Sage, 1999
 Buku Teks SO