Hitch, Charles J.
University of California Press, 1965
Buku Teks
Van de Ven, Andrew H.
Kent State University Press, 1974
Buku Teks
Hernon, Peter
Ablex, 1990
Buku Teks SO
Huxham, Mark
Prentice-Hall, 2000
Buku Teks SO
Fishburn, Peter C.
John Wiley & Sons, 1970
Buku Teks SO