Patton, Michael Quinn, author
SAGE Publ., 1986
Buku Teks
Epstein, Irwin, author
Columbia Univ. Press, 1977
Buku Teks
Alkin, Marvin C., author
Sage, 1985
Buku Teks
Russell Sage Foundation, 1971
Buku Teks
Posavac, Emil J.
Prentice Hall Inc., 1980
Buku Teks