Gibson, Lacey S. International Journal of Undergraduate Research and Creative Activities, 7, 20-01-2015, pàg. 1. DOI: 10.7710/2168-0620.1036 [Consulta: free].
Koops, Willem; Zuckerman, Michael The History of the Family, 8, 3, 01-01-2003, pàg. 345–354. DOI: 10.1016/S1081-602X(03)00041-1.
Acker, Michele; Davis, Mark H. Journal of Social and Personal Relationships, 9, 1, 1992, pàg. 21–50. DOI: 10.1177/0265407592091002.
Gibson, Lacey S. International Journal of Undergraduate Research and Creative Activities, 7, 20-01-2015, pàg. 1. DOI: 10.7710/2168-0620.1036 [Consulta: free].
Gibson, Lacey S. International Journal of Undergraduate Research and Creative Activities, 7, 20-01-2015, pàg. 1. DOI: 10.7710/2168-0620.1036 [Consulta: free].