Mackenzie, W.J.M
Penguin books, 1978
Buku Teks
Lipson, Leslie, author
Prentice-Hall, 1965
Buku Teks
Ranney, Austin
Prentice Hal, 1993
Buku Teks
Renwick, Alan.
Stanley Thornes Publishing, 1993
Buku Teks
Seta Basri, author
Indie Book Corner, 2011
Buku Teks