Andrews, Gladys
0, 1960
Buku Teks
Lawson, Hal A., author
Allyn and Bacon, 1981
Buku Teks
Dauer, Victor P., author
Burgess Publishing, 1975
Buku Teks
Tetelepta, Yosua Wilgert, author
Fakultas Teknik Universitas Indonesia, 2018
UI - Skripsi (Membership)
McCorkle, Chester O., author
Jossey-Bass Publishers, 1982
Buku Teks