Rose, Arnold M., author
Miniapolis, Minn. University of Minnesota Press. , 1954
Buku Teks
Berg, Bruce L. (Bruce Lawrence), 1954-, author
Pearson, 2004
Buku Teks
Aldine publishing, 1974
Buku Teks
edited by George Mckenzie, Jackie Powell, Robin Usher
The Falmer Press, 1997
Buku Teks
Stebbins, Robert A., author
Sage, 2001
Buku Teks