Burri, Andrea V.; Spector, Tim D. (1 de junio de 2011). «An Epidemiological Survey of Post-Coital Psychological Symptoms in a UK Population Sample of Female Twins». Twin Research and Human Genetics14 (3): 240-248. PMID21623654. doi:10.1375/twin.14.3.240.
Burri, Andrea V.; Spector, Tim D. (1 de junio de 2011). «An Epidemiological Survey of Post-Coital Psychological Symptoms in a UK Population Sample of Female Twins». Twin Research and Human Genetics14 (3): 240-248. PMID21623654. doi:10.1375/twin.14.3.240.