Artikel Jurnal
Flanigan, Orin
Gulf Publishing Company, 1995
Buku Teks
Natale, Christopher
Fairchild Books, 2009
Buku Teks
Paterson, John
John Wiley & Sons, 1977
Buku Teks
Tomlinson, M.J. (Michael John)
The Cement and Concrete Association, 1977
Buku Teks