Keynes, Edward
The Pennsylvania State University Press, 1982
Buku Teks
Langer, William L., author
P. Smith, 1968
Buku Teks
Chat, Le Van, author
Foreign Languagea Publishing House, 1962
Buku Teks
Meyer, Stephenie, 1973-, author
Gramedia Pustaka Utama, 2009
Buku Teks
Peters, Lance
Angus & Robertson, 1988
Buku Teks