Victoria A. Fromkin
Blackwell Publishers, 2001
Buku Teks
Pereltsvaig, Asya, 1972-, author
Cambridge University Press, 2012
Buku Teks
Martin, John C., author
McGraw-HIll, 1991
Buku Teks
Katzan, Harry, Jr., author
Auerbach, 1973
Buku Teks
Meehan, Diane, author
Stanley Thornes , 1990
Buku Teks