Clagett, Helen L.
Oceana Publications, 1952
Buku Teks
Thurber, Glarence E
Duke University Press, 1973
Buku Teks
Duke University Press, 1973
Buku Teks
edited by Eduardo P. Archetti
MacMillan Education, 1987
Buku Teks
Szulc, Tad, author
Atheneum, 1966
Buku Teks