Young, E.M.
Routledge , 1997
Buku Teks
Wortman, Sterling
Johns Hopkins University Press, 1979
Buku Teks
Stevens, Christopher
St. Martin's Press, 1979
Buku Teks
Kuznets, Simon Smith, 1901-, author
W.W. Norton&Company-Inc, 1965
Buku Teks
Chase, Harold W., author
Thomas Y. Crowell, 1964
Buku Teks