Fox, N.A., & Card, J. (1999). Psychophysiological measures in the study of attachment. In J. Cassidy & P. Shaver (Eds.), Handbook of attachment theory and research. pp. 226-245. New York:Guilford Press.

Fox, N.A., Kimmerly, N.L., & Schafer, W.D. (1991). Attachment to mother / attachment to father: A meta-analysis. Child Development, 62, 210-225.

Fox, N.A. (1977). Attachment of Kibbutz Infants to Mother and Metapelet. Child Development, 48, 1228-1239.