Cita APA (7a ed.)

Grant, P. R., & Grant, B. R. (2008). How and why species multiply: The radiation of Darwin's finches. Princeton University Press.

Cita Chicago Style (17a ed.)

Grant, Peter R., y B. Rosemary Grant. How and Why Species Multiply: The Radiation of Darwin's Finches. Princeton: Princeton University Press, 2008.

Cita MLA (9a ed.)

Grant, Peter R., y B. Rosemary Grant. How and Why Species Multiply: The Radiation of Darwin's Finches. Princeton University Press, 2008.