Buchman, Joseph
Englewood Cliffs, NJ, Prentice-Hall
Buku Teks SO
Pfammatter, Ulrich
Birkhauser, 2000
Buku Teks SO
Shuchman, Abe
Holt, Rinehart and Winston, Inc., 1963
Buku Teks SO
Cooke, Steve
Prentice-Hall, 1991
Buku Teks
Cooke, Steve
Prentice-Hall, 1991
Buku Teks SO