Caffey, Andrew A.
Entrepreneur Press, 2002
Buku Teks
by Curtis E. Tate Jr. ... [and others]
Business Publication, 1982
Buku Teks
Dersal, William R. Van
Harper & Brother, 1962
Buku Teks
Forsyth, Patrick, author
Institution of Engineering and Technology, 2008
eBooks
Greasley, Andrew
Stanley Thornes, 1999
Buku Teks