[by] Richard L. Scheaffer [and others]
Springer, 1996
Buku Teks SO
Tampahan, Binsar
Fakultas Ilmu Komputer Universitas Indonesia, 2004
UI - Skripsi Membership
Simini, Joseph Peter
McGraw-Hill, 1978
Buku Teks SO
Bimo Iman Santoso
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 1996
UI - Skripsi Membership
Chew, Sally
Times Books International, 1995
Buku Teks SO