Kuczynski
OxfortUniversity Press, 1949
Buku Teks
Hudson, W. J., author
Sydney University Press, 1970
Buku Teks
Boehmer, Elleke
Oxford : Oxford University Press, 1995
Buku Teks
Linden, Fred Van der
Bruxelles: La Renaisance du Livre, 1956
Buku Teks
Cespedes, Guillermo, author
Secretaria de Educacion, 1976
Buku Teks