Leslie D. "Doc" Long, Clifford Gordon, Charles F. Peck, Jack R. Benjamin
McGraw-Hill, 1982
Buku Referensi
Friedbert Kind-Barkauskas, Architect Bundesverbend, Deutnchens Zementidustrie, Cologne
Birkhauser, 2002
Buku Referensi
Moser, A.P.
McGraw-Hill, 2001
Buku Teks SO
ICBO, 2000
Buku Referensi
Nilson, Arthur H.
New York: John Wiley & Sons, 1987
Buku Teks