Geary D. Evolution and proximate expression of human paternal investment. Psychological Bulletin. 2000; 126: 55–77. См. также: Adler N., Boyce T., Chesney M., Cohen S., Folkman S., Kahn R., et al. Socioeconomic status and health: The challenge of the gradient. American Psychologist. 1994; 49: 15–24.