Wilensky, Harold L., author
Free Press, 1965
Buku Teks
Crampton, Helen M.
Ramdon House, 1970
Buku Teks
Jansson, Bruce S., author
Thompson, 2005
Buku Teks
Weinberger, Paul E., author
Macmillan, 1974
Buku Teks
Dinitto, Diana M., author
Pearson, 2012
Buku Teks