Johnson, Rodney D.
Prentice Hall of India, 1977
Buku Teks
Berkhout, A. J., 1940-, author
Geophysical Press, 1984
Buku Referensi
by Michael Cichon ... [and others]
International Labour Office, 1999
Buku Teks
Drury, Bill, author
Institution of Engineering and Technology, 2001
eBooks
Drury, Bill, author
Institution of Engineering and Technology, 2009
eBooks