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APA Citation
Mansergh, G., Shouse, R. L., Marks, G., Guzman, R., Rader, M., Buchbinder, S., & Colfax, G. N. (2006). methamphetamine and sildenafil (Viagra) use are linked to unprotected receptive and insertive anal sex, respectively, in a sample of men who have sex with men. Sexually transmitted infections, 82(2), 131–134. http://access.bl.uk/ark:/81055/vdc_100135159636.0x00000f