Villanueva, Tino
Fondo de Cultura Económica, 1980
Buku Teks
edited by Peter Lumb & Anne Hazell
Hodja Educational Resources Cooperative, 1983
Buku Referensi
Puette, William J.
Charles E. Tuttle, 1983
Buku Teks
Drury, Susan
Nelson, 1979
Buku Teks
edited by Ian Qusby
Cambridge University Press, 1988
Buku Referensi