Sargent, Margaret, author
Longman Chesire, 1979
Buku Teks
edited by Jack H. Mendelson and Nancy K. Mello
McGraw-Hill, 1979
Buku Teks
Robinson, David, author
University Park Press, 1979
Buku Teks
Velleman, Richard, author
Sage, 2003
Buku Teks
Denzin, Norman K.
Sage, 1986
Buku Teks