APA (7th ed.) Citation

Eddington, A. S. (1929). Science and the unseen world Swarthmore Lecture.

Chicago Style (17th ed.) Citation

Eddington, Arthur Stanley. "Science and the Unseen World." Swarthmore Lecture 1929.

MLA (8th ed.) Citation

Eddington, Arthur Stanley. "Science and the Unseen World." Swarthmore Lecture, 1929.

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