Campbell, James W. P., author
Thames& Hudson, 2003
Buku Teks
by Ernst J. Grube ... [et al.] ; edited by George Michell
Thames & Hudson, 1987
Buku Teks
Grosvenor Press International, T.t.
Buku Teks
Kiernan, Matthew J., author
American Management Association;, 2009
eBooks
Oshana, Maryann
Garland Publishing, 1985
Buku Referensi