Petruzella, Frank D., author
Macmillan Glencoe , 1989
Buku Teks
Harris Siswantoro, author
1996
UI - Tesis Membership
Siahaan, Sahat P., author
Universitas HKBP Nonmensen, 2018
Artikel Jurnal
Arie Maulana, author
Fakultas Teknik Universitas Indonesia, 2013
UI - Skripsi Membership
Taufik Iman R., author
Fakultas Teknik Universitas Indonesia, 2003
UI - Skripsi Membership