Higgins, Hugh
Heinemann Educational, 1975
Buku Teks
Woon, Park Seung
Fakultas Ilmu Pengetahuan Budaya Universitas Indonesia, 2018
UI - Skripsi Membership
Sumarno
2010
UI - Skripsi (Open)
Souter, Gerry
Andre Deutsch, 2015
Buku Referensi
editor in chief, Stanley I. Kutler
Charles Scribner's Sons, 1996
Buku Referensi