Darwin, C. (1897). The expression of the emotions in man and animals: With photographic and other illus ([Authorized ed.].). D. Appleton and company.
Lua i Stíl Chicago (17ú heag.)Darwin, Charles. The Expression of the Emotions in Man and Animals: With Photographic and Other Illus. [Authorized ed.]. New York: D. Appleton and company, 1897.
Lua MLA (8ú heag.)Darwin, Charles. The Expression of the Emotions in Man and Animals: With Photographic and Other Illus. [Authorized ed.]. D. Appleton and company, 1897.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.