King, Victor T.
Blackwell, 1993
Buku Teks
Mackinnon, John Ramsay
[publisher not identified], [date of publication not identified]
Buku Teks
Robinson, Danielm
Lonely Publications Pty Ltd, 2011
Buku Referensi
Bock, Carl
Graham Bush , 1988
Buku Teks
Pascal Couderc and Kenneth Sillander, editors
Nias Press, 2012
Buku Teks