[publisher not identified], [date of publication not identified]
Naskah
Anderson, J. M., editor
CAB International, 1993
Buku Referensi
Thampan, Palakasseril Kumaran
Oxford & IBH Publishing Co., 1981
Buku Referensi
Ketut Sudhana Astika, author
Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 1978
UI - Skripsi (Membership)
Smart, Huw, author
Oxford University Press, 2006
Buku Referensi