Brown, John Mason, author
Harper & Row, 1965
Buku Teks
Brown, John Mason, author
Harper & Row, 1965
Buku Teks
McCullough, Helen Craig, author
Princeton University Press, 1980
Buku Teks
Times Books, 1991
Buku Referensi
Kay, Dennis, author
Twayne, 1995
Buku Teks