Thurber, Glarence E
Duke University Press, 1973
Buku Teks
Duke University Press, 1973
Buku Teks
Routledge , 1993
Buku Teks
edited by Egbert De Vries, Jose Medina Echavarria
UNESCO, 1967
Buku Teks
Echavarria, Jose Medina
New York, N.Y., Unesco
Buku Teks