International Engineering Consortium
National Engineering Consortium., 1992
eBooks
Europa Publication Limited, 1994
Buku Referensi
Hawthorne, Nathaniel
Narasi, 2004
Buku Teks SO
Hawthorne, Nathaniel
Random House, 1992
Buku Teks SO
Wanda Katili
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 1983
UI - Skripsi Membership