Barnum D, JM Gleason and DT Barnum (1982). “Toward Valid Measures of Public Sector Productivity: Performance Indicators in Urban Transit.” Management Science 28 (4): 379-386.
Barnum D, JM Gleason and DT Barnum (1982). “Toward Valid Measures of Public Sector Productivity: Performance Indicators in Urban Transit.” Management Science 28 (4): 379-386.