edited by Lesley Barclay
Allen & Unwin , 1998
Buku Teks
Garland Publishing, Inc, 1996
Buku Teks
Dingus, Lowell, author
Carlton, 2012
Buku Referensi
Matuli-Walanda, A.P., author
Pustaka Sinar Harapan, 1989
Buku Teks
National Academy Press, 1989
Buku Teks