Ormsby, H.
Methuen, 1956
Buku Teks
Jones, Rodwell Ll., author
Methuen, 1950
Buku Teks
White, C. Langdon, author
Prentice-Hall, 1943
Buku Teks
Buning, J.W.F. Werumeus
AN. Donker, 1957
Buku Teks
Brachet, Michelle, author
Murray Books (Australia, 2012
Buku Referensi