Friesner DE, Peck LR. Comparison Group Identification for Difficult-to-Evaluate Populations: Lessons from Evaluating 1n10 LGBTQ Youth Support Services. J Multidiscip Eval [Internet]. 2007 Oct. 1 [cited 2024 Apr. 26];4(8):16-39. Available from: https://journals.sfu.ca/jmde/index.php/jmde_1/article/view/28