Bellwood, Peter, author
Auckland Collins 1978,
Buku Teks
Rouse, Irving
McGraw-Hill, 1972
Buku Teks
Kuhn, Herbert, author
Random House, 1955
Buku Teks
Scheele, William E., author
World Publishing, 1957
Buku Teks
Murray, Raymond W., author
Bruce Publishing, 1943
Buku Teks