Miller, John
Hyperion, 2002
Buku Teks
Weiner, Tim, author
Gramedia Pustaka Utama, 2008
Buku Teks
Lowenthal, Max
Greenwood Press, 1971
Buku Teks
Lowenthal, Max
William Sloane Associates, Inc., 1950
Buku Teks
Brown, Lou
St. Martin's Griffin , 1997
Buku Teks