Butler, Sue, author
England Armadillo, 2014
Buku Teks
Golinski, Jan, author
Cambridge University Press , 1992
Buku Teks
Cannadine, David
Papermac, 1996
Buku Teks
Nattrass, Laonora, author
Cambridge University Press, 2003
eBooks
Briggs, Asa
Longman, 1974
Buku Teks