Citra Kemala, author
Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 2013
UI - Skripsi (Membership)
Formby, David
Ure Smith, 1976
Buku Teks
Simanjuntak, Irene Desi Evelina, author
2016
UI - Tesis (Membership)
Longman Chesire, 1988
Buku Teks
Hollis, Christopher, author
Hollis & Carter, 1949
Buku Teks