Metcalf, Michael, author
Oxford University Press , 1990
Buku Teks
Chivers, Ian, author
Springer, 2012
eBooks
Nyhoff, Larry, author
Prentice-Hall, 1997
Buku Teks
Hutty, Roger, author
Erlangga, 1988
Buku Teks
McCracken, Daniel D., author
John Wiley & Sons, 1974
Buku Referensi