Ashworth, A. (1983). Building economics and cost control: Worked solutions. Butterworths.
Chicago-referens (17:e uppl.)Ashworth, A. Building Economics and Cost Control: Worked Solutions. London: Butterworths, 1983.
MLA-referens (9:e uppl.)Ashworth, A. Building Economics and Cost Control: Worked Solutions. Butterworths, 1983.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.