TY - JOUR A1 - Goodman, L.A. T1 - Comment: On respondent-driven sampling and snowball sampling in hard-to-reach populations and snowball sampling not in hard-to-reach populations Y1 - 2011 DO - 10.1111/j.1467-9531.2011.01242.x JF - Sociological Methodology VL - 41 IS - 1 ER -