Shipman, James T., author
D.C. Heath, 1990
Buku Teks
Middletown : Wesleyan University Press
Majalah, Jurnal, Buletin
Eagleton, Terry
Massachusetts Blackwell 1996,
Buku Teks
Chasnoff, With Ira J.
Publications International , 1991
Buku Teks
GreeneI, Harry L.
St.Louis Mosby 1998,
Buku Teks