.Warren, R. H. (1989). Motivation and productivity in the construction industry. Van Nostrand Reinhold.
Cita Chicago (17th ed.).Warren, Robert H. Motivation and Productivity in the Construction Industry. New York: Van Nostrand Reinhold, 1989.
Cita MLA (9th ed.).Warren, Robert H. Motivation and Productivity in the Construction Industry. Van Nostrand Reinhold, 1989.
Atenció: Aquestes cites poden no estar 100% correctes.