Elias, Elias A., author
Elias Modern Press, 1972
Buku Referensi
Dixson, Robert J., author
Regents Publishing, 1971
Buku Teks
Cowles, Roy T., author
South China Peniel Press, 1949
Buku Referensi
Nicholson, Margaret, author
Oxford University Press, 1957
Buku Referensi
Wichman, K., author
New York, David Mckay Company
Buku Referensi