Collins, E. T. (1932) “The Physiology of Weeping”, British Journal of Ophthalmology16: 1-20.
2.
MacLean, P. D. (1985) “Brain Evolution Relating to Family, Play, and the Separation Call”, Archives of General Psychiatry42: 405-417.
3.
MacLean, P. D. (1986) “Culminating Developments in the Evolution of the Limbic System: The Thalamocingulate Division”, in B. K. Doane and K. E. Livingston (eds) The Limbic System: Functional Organization and Clinical Disorders, pp. 1-28. New York: Raven Press.
4.
MacLean, P. D. (1987) “The Midline Frontolimbic Cortex and the Evolution of Crying and Laughter”, in E. Perecman (ed.) The Frontal Lobes Revisisted. New York: The IRBN Press.
5.
Newman, J. D. and MacLean, P. D. (1985) “Importance of Medial Frontolimbic Cortex in Production of the Isolation Call of Squirrel Monkeys”, Society for Neuroscience11: 496.