Darwin, C., Barrett, P. H., & Freeman, R. B. (1989). The expression of the emotions in man and animals. Pickering.
Citazione stile Chigago Style (17a edizione)Darwin, Charles, Paul H. Barrett, e R. B. Freeman. The Expression of the Emotions in Man and Animals. London: Pickering, 1989.
Citatione MLA (8a ed.)Darwin, Charles, et al. The Expression of the Emotions in Man and Animals. Pickering, 1989.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.