Study by Douglas Sloane, Herbert Smith, Linda Aiken and Matthew McHugh (U Penn) on the effect of nursing resources on the quality of care has been quoted in The Nation
"More Nurses Means Better Care—So Why Did This Ballot Measure Fail?" - The Nation. 11/15/2018.
"A major recent study by University of Pennsylvania researchers, covering more than 730 hospitals, showed that “Improvements within hospitals in work environments, nurse staffing, and educational composition of nurses coincide with improvements in quality of care and patient safety.”