Cita APA (7th ed.)

Duckworth, H. E. (1963). Little men in the unseen world: A guide to atomic physics. Macmillan.

Cita Chicago (17th ed.)

Duckworth, Henry E. Little Men in the Unseen World: A Guide to Atomic Physics. London: Macmillan, 1963.

Cita MLA (9th ed.)

Duckworth, Henry E. Little Men in the Unseen World: A Guide to Atomic Physics. Macmillan, 1963.