Bledsoe, Robert L., author
ABC-Clio, 1987
Buku Referensi
Martin Basiang
Red & White Publishing, 2009
Buku Referensi
Vega, Connie de la, author
Edward Elgar, 2013
Buku Referensi
Vega, Connie de la, author
Edward Elgar Publishing, 2013
Buku Referensi
Morales-Macedo, Fernando
Alphen Aan den Rijn, 1979
Buku Teks