edited by Carolyn Denham and Ann Lieberman
Program on Teaching and Learning, 1980
Buku Teks
Werner, David, author
Hesperian Foundation , 1982
Buku Teks
Kidd
Cambridge University Press, 1973
Buku Teks
Seonggyun-gwan Daehakyo Chulpanbu, 2009
Buku Teks
Buku Teks