APA-Zitierstil (7. Ausg.)

Darwin, C. (1899). The different forms of flowers on plants of the same species (2. ed.). Appleton.

Chicago-Zitierstil (17. Ausg.)

Darwin, Charles. The Different Forms of Flowers on Plants of the Same Species. 2. ed. New York: Appleton, 1899.

MLA-Zitierstil (9. Ausg.)

Darwin, Charles. The Different Forms of Flowers on Plants of the Same Species. 2. ed. Appleton, 1899.