Perry, Walter
The Open University Press, 1976
Buku Teks
Ahmad Syafiq, author
UI-Press, 2014
Buku Teks
Brockliss, L. W. B., author
Oxford University Press, 2016
eBooks
Academic Press, 1968
Buku Teks
Thompson, James, author
Clive Bingley, 1987
Buku Teks