The Pre-Socratic philosophers : a companion to Diels, Fragmente der Vorsokratiker.

MLA

Freeman, Kathleen, and Hermann Diels. The Pre-socratic Philosophers : a Companion to Diels, Fragmente Der Vorsokratiker. Oxford: Blackwell, 1946.

APA

Freeman, K., & Diels, H. (1946). The Pre-Socratic philosophers : a companion to Diels, Fragmente der Vorsokratiker. Oxford: Blackwell.

Chicago

Freeman, Kathleen, and Hermann Diels. The Pre-Socratic Philosophers : a Companion to Diels, Fragmente Der Vorsokratiker. Oxford: Blackwell, 1946.