Melva Christiana, author
Fakultas Ilmu Sosial dan Ilmu Politik Universitas Indonesia, 2012
UI - Skripsi (Open)
Sinaga, William Ishak, author
Fakultas Teknik Universitas Indonesia, 2016
UI - Skripsi (Membership)
Schusky, Ernest l.
Prentice-Hall, 1973
Buku Teks
Gordon Wills ... [and others]
Pan Books, 1975
Buku Teks
Knowles, Murray, author
Routledge, 2006
Buku Teks