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
Bodard, Lucien
Atlantic Monthly Press Book, 1967
Buku Teks
Souter, Gerry
Andre Deutsch, 2015
Buku Referensi