Lind, Andrew W.
University Press of Hawaii, 1974
Buku Teks SO
Elliott, Alan J.
[publisher not identified], [date of publication not identified]
Buku Teks
Morton, John K.
Airlife, 2001
Buku Teks
Song, Ong Siang
University Malaya Press, 1967
Buku Teks
Faculty of Law National University of Singapore, 2018
Majalah, Jurnal, Buletin