Knapp, Stephen
Pockport Pub, 1998
Buku Referensi
Forch, Matthias
Springer Nature, 2019
eBooks
King, Carol Soucek
PBC International, 1996
Buku Teks
Vandenberg, Maritz
Academy Editions , 1997
Buku Teks
Fakultas Teknik Universitas Indonesia, 1992
UI - Skripsi Membership