Fólki líkar best við þá sem líkjast þeim sjálfum mest.
- Buss, D. M. (1985) Human mate selection. American Scientist, 73(1), 47-51.
- Byrne, D., Ervin, C. R. og Lamberth, J. (1970). Continuity between the experimental study of attraction and real-life computer dating. Journal of Personality and Social Psychology, 16(1), 157-165.
- Price, R. A. og Vandenberg, S. G. (1980). Spouse similarity in American and Swedish couples. Behavior genetics, 10(1), 59-71.
- Image:TripletsGirls.jpg. Wikipedia, frjálsa alfræðiorðabókin. Myndin er birt undir leyfinu GNU Free Documentation License.