APA (7th ed.) Citation

Whitehead, A. N. (1955). An enquiry concerning the principles of natural knowledge.

Chicago Style (17th ed.) Citation

Whitehead, Alfred North. An Enquiry Concerning the Principles of Natural Knowledge. 1955.

MLA (9th ed.) Citation

Whitehead, Alfred North. An Enquiry Concerning the Principles of Natural Knowledge. 1955.

Warning: These citations may not always be 100% accurate.