Ringel, william E.
Clark Boardman Company Ltd., 1972
Buku Teks
R. Soenarto Soerodibroto, author
[publisher not identified], 1979
Buku Teks
Lubis, Fitri Handayanti, author
Universitas Indonesia, 2013
UI - Skripsi (Membership)
Yusnita, author
2019
UI - Tugas Akhir
Turvey, Brente E. , author
Elsevier, 2012
Buku Teks