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Spence, M. (2005). Visual cliff. In N. Salkind (Ed.), Encyclopedia of human development. (pp. 1310-1311). Thousand Oaks, CA: SAGE Publications, Inc. doi:

Spence, Melanie J. "Visual Cliff." Encyclopedia of Human Development. Ed. Neil J. Salkind. Thousand Oaks, CA: SAGE Publications, Inc., 2005. 1310-11. SAGE knowledge. Web. 2 Dec. 2015.

Spence, Melanie J. "Visual Cliff." In Encyclopedia of Human Development, edited by Neil J. Salkind, 1310-11. Thousand Oaks, CA: SAGE Publications, Inc., 2005. doi:

Spence, M 2005, ‘Visual cliff’, in NJ Salkind (ed.), Encyclopedia of human development, SAGE Publications, Inc., Thousand Oaks, CA, pp. 1310-1, viewed 2 December 2015, doi: