Darwin, C., Ekman, P., & Prodger, P. (1999). The expression of the emotions in man and animals: Charles Darwin (3d ed. / with an introd., afterword and comm. by Paul Ekman. Essay on the history of the illustrations by Philip Prodger.). Harper Collins Publ..

Darwin, Charles, Paul Ekman, and Philip Prodger. The Expression of the Emotions in Man and Animals: Charles Darwin. 3d ed. / with an introd., afterword and comm. by Paul Ekman. Essay on the history of the illustrations by Philip Prodger. London: Harper Collins Publ., 1999.

Darwin, Charles, et al. The Expression of the Emotions in Man and Animals: Charles Darwin. 3d ed. / with an introd., afterword and comm. by Paul Ekman. Essay on the history of the illustrations by Philip Prodger. Harper Collins Publ., 1999.