APA (7e ed.) Bronvermelding

Guthrie, W. K. C., & Guthrie, W. K. C. (1977). The earlier Presocratics and the Phythagoreans. Cambridge Univ. Press.

Chicago (17e ed.) Bronvermelding

Guthrie, William Keith Chambers, en William Keith Chambers Guthrie. The Earlier Presocratics and the Phythagoreans. Cambridge [u.a.]: Cambridge Univ. Press, 1977.

MLA (8e ed.) Bronvermelding

Guthrie, William Keith Chambers, en William Keith Chambers Guthrie. The Earlier Presocratics and the Phythagoreans. Cambridge Univ. Press, 1977.