Roisman, Glenn I.; Clausell, Eric; Holland, Ashley; Fortuna, Keren; Elieff, Chryle . (2008). Adult romantic relationships as contexts of human development: A multimethod comparison of same-sex couples with opposite-sex dating, engaged, and married dyads.. Developmental Psychology, 44(1), 91–101.
doi:10.1037/0012-1649.44.1.91