Ethridge, Marcus E., author
Wadsworth, 2010
Buku Teks
Corbett, Sister Thomas Albert
University of America Press, 1950
Buku Teks
Edited by: Hwa Yol Jung
1895, 2002
Buku Teks
Curtis, Michael, author
Harper & Row, 1978
Buku Teks
Hagopain, Mark N.
Longman, 1978
Buku Teks