Hesse-Biber, Sharlene Nagy
Sage, 2007
Buku Teks SO
Wilson, Holly Skodol
Addison-Wesley, 1985
Buku Teks
[publisher not identified], [date of publication no identified]
Buku Teks
[publisher not identified], [date of publication no identified]
Buku Teks
Rosnow, Ralph L.
Prentice-Hall, 1996
Buku Teks SO