1. Ainsworth, M. D. S., Bell, S. M., & Stayton, D. J. (1971). Individual differences in strange-situation behavior of one-year-olds. In H. R. Schaffer (Ed.), The origins of human social relations (pp. 17–58). London: Academic.
2. Ainsworth, M. D. S., Blehar, M. C., Waters, E., & Wall, S. (1978). Patterns of attachment: A psychological study of the strange situation. Hillsdale: Erlbaum.
3. Andersen, P. A. (2008). Nonverbal communication: Forms and functions (2nd ed.). Mountainview: Mayfield Publ. Co.
4. Andersen, P. A., & Leibowitz, K. (1978). The development and nature of the construct touch avoidance. Environmental Psychology and Nonverbal Behavior, 3, 89–106. doi: 10.1007/BF01135607 .
5. Andersen, P. A., & Sull, K. K. (1985). Out of touch, out of reach: tactile predispositions as predictors of interpersonal distance. The Western Journal of Speech Communication, 49, 57–72. doi: 10.1080/10570318509374181 .