Bellwood, Peter, author
Auckland Collins 1978,
Buku Teks
Edel, May, author
Little, Brown, 1955
Buku Teks
Murray, Raymond W., author
Bruce Publishing, 1943
Buku Teks
Kuhn, Herbert, author
Random House, 1955
Buku Teks
Scheele, William E., author
World Publishing, 1957
Buku Teks