Daudistel, Howard C., author
Holt, Rine hart and Winston, 1979
Buku Teks
Viano, Emilio C., author
Nelson-Hall, 1975
Buku Teks
Siegel, Larry J., 1959-, author
Wadsworth and Cengage Learning, 2013
Buku Teks
Alpert, Geoffrey P., author
Sage, 1985
Buku Teks
Cole, George F., author
Brooks/Cole, 1986
Buku Teks