Grover, R. L.; Nangle, D. W.; Serwik, A.; Zeff, K. R. (2007). "Girl friend, boy friend, girlfriend, boyfriend: Broadening our understanding of heterosocial competence". Journal of Clinical Child and Adolescent Psychology. 36 (4): 491–502. doi:10.1080/15374410701651637. PMID18088208. S2CID26125186.
Wentland, Jocelyn J.; Reissing, Elke (December 2014). "Casual sexual relationships: Identifying definitions for one night stands, booty calls, fuck buddies, and friends with benefits". The Canadian Journal of Human Sexuality. 23 (3): 167–177. doi:10.3138/cjhs.2744. S2CID144685114.
Grover, R. L.; Nangle, D. W.; Serwik, A.; Zeff, K. R. (2007). "Girl friend, boy friend, girlfriend, boyfriend: Broadening our understanding of heterosocial competence". Journal of Clinical Child and Adolescent Psychology. 36 (4): 491–502. doi:10.1080/15374410701651637. PMID18088208. S2CID26125186.
Grover, R. L.; Nangle, D. W.; Serwik, A.; Zeff, K. R. (2007). "Girl friend, boy friend, girlfriend, boyfriend: Broadening our understanding of heterosocial competence". Journal of Clinical Child and Adolescent Psychology. 36 (4): 491–502. doi:10.1080/15374410701651637. PMID18088208. S2CID26125186.
Wentland, Jocelyn J.; Reissing, Elke (December 2014). "Casual sexual relationships: Identifying definitions for one night stands, booty calls, fuck buddies, and friends with benefits". The Canadian Journal of Human Sexuality. 23 (3): 167–177. doi:10.3138/cjhs.2744. S2CID144685114.