Aston, Elaine, author
Routledge, 1991
Buku Teks
Kessels, AHM
Hes Publisher, 1978
Buku Teks
Bowers, Faubion, author
Hermitage House, 1952
Buku Teks
Berry, George Ricker, author
Chicago, Fallet Publishing, 1962
Buku Referensi
Oostrom, F. van
Prometheus, 1992
Buku Teks