Arini Rindang Kasih, author
2017
UI - Tugas Akhir
Universitas Indonesia, 1991
UI - Skripsi Membership
Silalahi, Patricia Samantha, author
2013
UI - Tesis Membership
Hausman, Carl
Harper Collins, 1992
Buku Teks
Sitepu, Helen, author
Universitas Indonesia, 2006
UI - Skripsi Membership