Dickey H, Watson V, Zangelidis A. Is it all about money? An examination of the motives behind moonlighting. Appl Econ. 2010 Nov 3;43(26):3767-74. doi: 10.1080/00036841003724403
McKenna SP, Whalley D, Doward LC. Which outcomes are important in schizophrenia? Int J Methods Psychiatr Res. 2000;9(1):S58-67.