RT Journal Article SR Electronic T1 Finding Insights on Hard-to-Reach Targets JF Journal of Advertising Research JO J Advert Res FD WARC SP 339 OP 340 DO 10.2501/JAR-2016-039 VO 56 IS 4 A1 Geoffrey Precourt YR 2016 UL http://www.journalofadvertisingresearch.com/content/56/4/339.abstract AB