Barr, C. S., Schwandt, M. L., Lindell, S. G., Higley, J. D., Maestripieri, D., Goldman, D., . . . Heilig, M. (2008). Variation at the mu-opioid receptor gene (OPRM1) influences attachment behavior in infant primates. National Academy of Sciences.

Barr, Christina S., Melanie L. Schwandt, Stephen G. Lindell, J. Dee Higley, Dario Maestripieri, David Goldman, Stephen J. Suomi, and Markus Heilig. Variation At the Mu-opioid Receptor Gene (OPRM1) Influences Attachment Behavior in Infant Primates. National Academy of Sciences, 2008.

Barr, Christina S., et al. Variation At the Mu-opioid Receptor Gene (OPRM1) Influences Attachment Behavior in Infant Primates. National Academy of Sciences, 2008.