Newmeyer, Sarah, author
New American Library , 1955
Buku Teks
Kitley, Philip, author
Darling Downs Institute Press, 1986
Buku Referensi
Arnason, H. Harvard, author
Thames & Hudson, 1998
Buku Referensi
Ballinger, Raymond A., author
Reinhold, 1956
Buku Teks
Archer, WG
London George Allen & Unwin ltd [1959]
Buku Teks