Vickers, Adrian, author
Cambridge University Presss, 2007
Buku Teks
Cribb, Robert Bridson, author
Longman, 1995
Buku Teks
Vickers, Adrian, 1958-, author
Cambridge University Press, 2013
Buku Teks
Cary, Otis
Charles E. Tuttle, 1976
Buku Teks
Wood, Michael, author
Ombak, 2013
Buku Teks