Fisse, Brent
Cambridge University Press, 1993
Buku Teks
Fisse, Brent
Cambridge University Press, 1993
Buku Teks SO
Hamilton, Robert W.
West Publishing, 1992
Buku Teks
Henn, Harry, Alexander, John R
St.Paul,Minn : West publishing Co, 1983,
Buku Referensi
Hamilton, Robert W.
West Publishing, 1996
Buku Teks