Não informado. (2003). Contractors record and municipal engineering. [s.n.].
Chicago-referens (17:e uppl.)Não informado. Contractors Record and Municipal Engineering. [s.l.]: [s.n.], 2003.
MLA-referens (8:e uppl.)Não informado. Contractors Record and Municipal Engineering. [s.n.], 2003.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.