Stephenson, J., Strange, V., Allen, E., Copas, A., Johnson, A., Bonell, C., . . . Team, R. S. (2008). The long-term effects of a peer-led sex education programme (RIPPLE): A cluster randomised trial in schools in England. Public Library of Science (PLoS).
Cita Chicago Style (17a ed.)Stephenson, Judith, Vicki Strange, Elizabeth Allen, Andrew Copas, Anne Johnson, Chris Bonell, Abdel Babiker, Ann Oakley, y RIPPLE Study Team. The Long-term Effects of a Peer-led Sex Education Programme (RIPPLE): A Cluster Randomised Trial in Schools in England. Public Library of Science (PLoS), 2008.
Cita MLA (8a ed.)Stephenson, Judith, et al. The Long-term Effects of a Peer-led Sex Education Programme (RIPPLE): A Cluster Randomised Trial in Schools in England. Public Library of Science (PLoS), 2008.