Goddard, Harold C., author
Phienix Books, 1990
Buku Teks
John Wiley & Sons Inc, 2017
Buku Teks
Thomson, Belinda, author
Thames & hudson, 2000
Buku Referensi
Bowie, Andrew, author
Routledge , 1997
Buku Teks
Rees, Leslie, 1905-2000, author
Angus and Roberson, 1973
Buku Teks