Pfeifer Gunter, Rolf Ramcke, Joachim Achtziger, Konrad Zilch
Birkhauser, 2001
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Graham, Frank Duncan, author
Theodore Audel & Co., 1961
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Friedbert Kind-Barkauskas, Architect Bundesverbend, Deutnchens Zementidustrie, Cologne
Birkhauser, 2002
Buku Referensi
Leslie D. "Doc" Long, Clifford Gordon, Charles F. Peck, Jack R. Benjamin
McGraw-Hill, 1982
Buku Referensi
Waddell, Joseph J., author
McGraw-Hill, 1985
Buku Referensi