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.
American Management Association;, 2009
eBooks
Oshana, Maryann
Garland Publishing, 1985
Buku Referensi
Grolier Incorporated, 1964
Buku Referensi