Adam Ritcjie, Randall Thomas, editor
Taylor & Francis Group, 2009
Buku Teks SO
Leitmann, Josef
McGraw-Hill, 1999
Buku Teks SO
The World Bank, [date of publication not identified]
Buku Teks
Lang, Jon
Van Nostrand Reinhold, 1994
Buku Referensi
Barnett, Jonathan
Architectural Record Books, 1974
Buku Teks