Darwin, C. (2013). The expression of the emotions in man and animals. Cambridge University.
Citazione stile Chigago Style (17a edizione)Darwin, Charles. The Expression of the Emotions in Man and Animals. London: Cambridge University, 2013.
Citatione MLA (9a ed.)Darwin, Charles. The Expression of the Emotions in Man and Animals. Cambridge University, 2013.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.