Buchholdt, H.A., author
Thomas Telford, 1997
Buku Teks
Underwood, James R., author
Wiley, 2007
Buku Teks
Underwood, James R., author
John Wiley & Sons, 1998
Buku Referensi
Ochshorn, Jonathan, author
Elsevier, 2010
Buku Teks
Dowrick, D. J., author
John Wiley & Sons, 1977
Buku Referensi