Hughes, Dick
Marlin Books, 1977
Buku Teks
Yudha Trisna Wati
Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 2007
UI - Skripsi (Membership)
Hetherington, John Aikman, 1907-
Cheshire, 1960
Buku Teks
Boerner, Peter
Hamburg Rowohlt Taschenbuch 1964
Buku Teks
Herdi Sahrasad
Freedom Foundation, [date of publication not identified]
Buku Teks