APA (7th ed.) Citation

Spearman, C. E. (1923). The nature of Intelligence and the principles of cognition. MacMillan and Co.

Chicago Style (17th ed.) Citation

Spearman, Charles Edward. The Nature of Intelligence and the Principles of Cognition. London: MacMillan and Co, 1923.

MLA (9th ed.) Citation

Spearman, Charles Edward. The Nature of Intelligence and the Principles of Cognition. MacMillan and Co, 1923.

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