Norton, Peter
[publisher not identified], [date of publication not identified]
Buku Teks SO
Desmonde, William H.
Prentice-Hall, 1969
Buku Teks SO
Simpson, Henry
McGraw-Hill, 1986
Buku Teks SO
Davis, Trisha
Mecklermedia Corporation, 1994
Buku Teks SO
Porter, Alan
Reading, Mass.: Addison-Wesley, c1985
Buku Teks