1. The pandemic's second act: many ENR Top 400 contractors plan a return to normal, but will the COVID‐19 vaccine be a shot in the arm or a shot in the dark?;Adolphus E.;Engineering News Record,2021
2. Barriers to New Competition
3. Bowdich G.andRuneson G.(1985).Unpublished survey of the building industry in the Wollongong area.