Gregorius A. Gegana A.
Fakultas Teknik Universitas Indonesia, 2007
UI - Skripsi Membership
Emmitt, stephen
Wiley-Blackwell, 2012
Buku Teks
Glass, Jacqueline
Wiley-Academy, 2002
Buku Referensi
Hale, Jonathan A.
John Wiley & Sons, 2000
Buku Teks
Robinson, Jeremy
New York: McGraw-Hill, 1979
Buku Teks