Παραπομπή σε μορφή APA (7η εκδ.)

Larkum, A. W. D. (2009). A Natural Calling: Life, Letters and Diaries of Charles Darwin and William Darwin Fox. Springer Netherlands.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Larkum, Anthony W. D. A Natural Calling: Life, Letters and Diaries of Charles Darwin and William Darwin Fox. Dordrecht: Springer Netherlands, 2009.

Παραπομπή σε μορφή MLA (8th εκδ.)

Larkum, Anthony W. D. A Natural Calling: Life, Letters and Diaries of Charles Darwin and William Darwin Fox. Springer Netherlands, 2009.