Burton, Sue, author
Page One Publishing, 2003
Buku Referensi
Galton, Jeremy, author
Page One Publishing, 2003
Buku Referensi
Grolier Incorporated, 1965
Buku Referensi
Marcucci, Luisa, author
Studio Books , 1960
Buku Referensi
Watson Guptill Publications, 2002
Buku Teks