Regnér, Håkan. ”Stephen H Bell, Larry L Orr, John D Blomquist & Glen G Cain: Program Applicants As a Comparison Group in Evaluating Training Programs”. Arbetsmarknad & Arbetsliv, vol. 2, nr 2, december 2022, s. 145-9, https://journals.lub.lu.se/aoa/article/view/24712.