Thurber, Glarence E
Duke University Press, 1973
Buku Teks
Clagett, Helen L.
Oceana Publications, 1952
Buku Teks
St.Martin`s Press, 1971
Buku Teks
Duke University Press, 1973
Buku Teks
edited by Egbert De Vries, Jose Medina Echavarria
UNESCO, 1967
Buku Teks