Howard, J. (2001). Darwin: A Very Short Introduction (1st.). Oxford.
Cita Chicago (17th ed.)Howard, Jonathan. Darwin: A Very Short Introduction. 1st. Oxford, 2001.
Cita MLA (9th ed.)Howard, Jonathan. Darwin: A Very Short Introduction. 1st. Oxford, 2001.
Atenció: Aquestes cites poden no estar 100% correctes.