Fryer, Harold
Stagecoach Publishing, 1977
Buku Teks
MacGregor, James G., author
Hurtig Publishers, 1981
Buku Teks
Buley, R. Carlyle, author
Indiana University Press, 1962
Buku Teks
Rolls, Eric
Nelson, 1981
Buku Teks
Durack, Mary, author
Rigby, 1973
Buku Teks