Cambridge University Press, 2007
eBooks
Trusov, A.
[publisher not identified], [date of publication not identified]
Buku Teks
Kay, Adrian., author
Edward Elgar, 2006
Buku Teks
Walter, Eugene Victor, author
Chapel Hill, 1988
Buku Teks
Baddeley, Alan, author
Lawrence Erlbaum Associates, 1990
Buku Teks