edited by C.K. Stead
Macmillan, 1971
Buku Teks SO
Hemmerechts, Kristien
Atlas, 2004
Buku Teks
Moore, Alan
Gramedia Pustaka Utama, 2006
Buku Teks SO
Green, D.C.
Longman, 1993
Buku Teks
[Publisher not identified], [Date of publication not identified]
Naskah