Gomberg, Karen Cornell
McFarland, 1990
Buku Teks SO
edited by John P. Holdren, Eric Donald Hirsch
Delta Pub., 1996
Buku Teks SO
Carlsen, G. Robert
Harper & Row, 1971
Buku Referensi
Zena
Buku Teks
Legge, James
[publisher not identified], [date of publication not identified]
Buku Referensi