Darwin, C., & Darwin, F. (1969). The foundations of the origin of species: Two essays written in 1842 and 1844. New York: Kraus Reprint.
Παραπομπή Chicago StyleDarwin, Charles, and Francis Darwin. The Foundations of the Origin of Species: Two Essays Written in 1842 and 1844. New York: Kraus Reprint, 1969.
Παραπομπή MLADarwin, Charles, and Francis Darwin. The Foundations of the Origin of Species: Two Essays Written in 1842 and 1844. New York: Kraus Reprint, 1969.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.