edited by Miroslaw Pawlak
Springer, 2012
eBooks
edited by Anthony Gale, Michael W. Eysenck
John Wiley & Sons, 1992
Buku Referensi
Donald Freeman and Jack C. Richardsand , author
Cambridge Cambridge University Press 1996
Buku Teks
Brown, Douglas, author
Pearson Longman, 2007
Buku Teks
Cook, Vivian, author
ARNOLD, 2001
Buku Teks