Παραπομπή σε μορφή APA (7η εκδ.)

Mackie, P. (2006). How things might have been: Individuals, kinds, and essential properties. Clarendon Press ; Published in the United States by Oxford University Press.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Mackie, Penelope. How Things Might Have Been: Individuals, Kinds, and Essential Properties. Oxford : New York: Clarendon Press ; Published in the United States by Oxford University Press, 2006.

Παραπομπή σε μορφή MLA (8th εκδ.)

Mackie, Penelope. How Things Might Have Been: Individuals, Kinds, and Essential Properties. Clarendon Press ; Published in the United States by Oxford University Press, 2006.