Ashby, Mike
Butterworth-Heinemann, 2014
eBooks
Ashby, Michael F.
Elsevier, 2014
Buku Teks SO
Neider, Charles, editor
Routledge and Kegan Paul Ltd, 1949
Buku Teks SO
Gillete, Hendry S
Franklin Watts , 1962
Buku Teks SO
Warren, Catriona, ; Lee, David ; King, Tabetha, edited
Art Review Ltd, 1996
Buku Referensi