Wason, Paul K., author
Cambridge University Press, 2009
eBooks
Cambridge University Press, 1994
eBooks
Allison, Penelope M.
Routledge, 1999
Buku Teks
edited by Kelley Hays-Gilpin and David S. Whitley
Routledge, 1998
Buku Teks
edited by Marcello A. Canuto and Jason Yaeger
Routledge, 2000
Buku Teks