Peilou, E.C.
John Wiley & Sons, 1979
Buku Teks
Hengeveld, R.
Cambridge University Press, 1990
Buku Teks
Mielke, H.W.
Unwin Hyman, 1988
Buku Teks
Huggett, Richard John
Routledge, 1998
Buku Referensi
Cox, C. Barry, author
Blackwell Scientific, 1985
Buku Teks