Darwin, C. (2002). The complete works of Charles Darwin online.
Chicago-Zitierstil (17. Ausg.)Darwin, Charles. The Complete Works of Charles Darwin Online. Cambridge, 2002.
MLA-Zitierstil (8. Ausg.)Darwin, Charles. The Complete Works of Charles Darwin Online. 2002.
警告：這些引文格式不一定是100％准確.