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APA Citation
Ober, A. J., Sussell, J., Kilmer, B., Saunders, J., & Heckathorn, D. D. (2016). using Respondent-Driven Sampling to Recruit Illegal Drug Purchasers to Evaluate a Drug Market Intervention. Evaluation review, 40, 87–121. http://access.bl.uk/ark:/81055/vdc_100065069206.0x000003