Rock, Irvin
Macmillan Publishing Co, Inc, 1975
Buku Teks
Karina Arifin, author
Unesco Publishing, 2004
Buku Referensi
Whistley, David S, author
Left Coast Press, inc., 2005
Buku Teks
Whitley, David S., author
California Left Coast Press, 2011
Buku Teks
McNally, G. H., author
E & FN Spon, 1998
Buku Teks