Baily, H. Heaton, author
John Wiley & Sons, 1959
Buku Teks
Wood, Frank
Pitman, 1983
Buku Teks
Simamora, Henry, author
Salemba Empat, 2000
Buku Teks
Berry, Aidan
Chapman and Hall, 1991
Buku Teks
Bowhill, Bruce, author
John Wiley & Sons, 2008
Buku Teks