APA (7th ed.) Citation

Cardwell, G. (1962). Twins of genius. N. Spearman.

Chicago Style (17th ed.) Citation

Cardwell, Guy. Twins of Genius. London: N. Spearman, 1962.

MLA (8th ed.) Citation

Cardwell, Guy. Twins of Genius. N. Spearman, 1962.

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