Charlebois, Peter
New Canada Publications, 1975
Buku Teks
Salsabilla Said
Fakultas Teknik Universitas Indonesia, 2020
UI - Skripsi (Membership)
edited by Thomas H Briggs, Max J. Herzberg, Emma Miller Bolenius
Mifflin , 1932
Buku Teks
Ruchs, Barbara
New York : Routledge , 2004
Buku Teks
Manzer, Ronald A.
McGraw-Hill Ryerson, 1974
Buku Teks