Paoli, Carlo De, author
Headline Book Publishing, 1995
Buku Referensi
Maxwell-Hudson, Clare, author
Dorling Kindersley, 1988
Buku Referensi
Jarmey, Chris, author
Gaia Books, 1991
Buku Teks
Bakhru, author
Pashupati Printers, 2017
Buku Teks
McIntyre, Anne
Goin Books , 1992
Buku Teks