Sanders, Lawrence
Berkley books , 1988
Buku Teks
Folsom, James K., author
Twayne Publishers, 1965
Buku Teks
Findley, Timothy
Clarke, Irwin, 1977
Buku Teks
Sanders, P.
Kluwer-Deventer , 1981
Buku Teks
Southall, Ivan, author
Melbourne: Oxford University Press, 1964
Buku Teks