Jansson, Bruce S., author
Thompson, 2005
Buku Teks
Crampton, Helen M.
Ramdon House, 1970
Buku Teks
Wilensky, Harold L., author
Free Press, 1965
Buku Teks
Dinitto, Diana M., author
Pearson, 2012
Buku Teks
edited by Leonard H. Goodman
Columbia University Press, 1966
Buku Teks