Curtius, Ernst Robert
London Routledge & Kegan Paul [1953]
Buku Teks
Robinson, O.F., author
Frofessional Books Limited, 1985
Buku Teks
Foxley, Alejandro
University of California Press , 1983
Buku Teks
Wiarda, Howard J., author
Wardword, 1995
Buku Teks
Westview Press, 1980
Buku Teks