Artikel Jurnal
Ahmad Fadlan Awriya
Fakultas Teknik Universitas Indonesia, 2019
UI - Tugas Akhir
Rahner, Karl
The Crossroad Publishing Company, 1981
Buku Referensi
Doyglas J. Davies
Berg, 2002
Buku Teks SO
edited by Peter Byrne, Leslie Houlden
Routledge, 1995
Buku Referensi