@article{Goodman2011,
author = {Goodman, L.A.},
title= {Comment: On respondent-driven sampling and snowball sampling in hard-to-reach populations and snowball sampling not in hard-to-reach populations},
year = {2011},
doi = {10.1111/j.1467-9531.2011.01242.x},
journal = {Sociological Methodology},
volume = {41},
number = {1},
pages = {347--53},
}