References
- Redmond and Davies . 1935 . The Standardization of two Intelligence Tests , New Zealand Council for Educational Research .
- et al. Studies on a child population Ann. Eugen., Lond. vols, vi, viii, x
- Royal Commission on Population . Report 154 – 5 .
- Vernon and Parry . 1942 . Personnel Selection in the British Forces , University of London Press .
- Somerset , H. D. Littledene , New Zealand Council for Educational Research .
- Blackburn , J. and Burt , Cyril . 1947 . Population Studies , I : 165 – 86 .
- Burt , Cyril . 1946 . Intelligence and Fertility Occasional Papers on Eugenics
- Thomson , Godfrey . 1947 . The Trend of National Intelligence , Occasional Papers on Eugenics .
- Fisher , R. A. 1930 . The Genetical Theory of Natural Selection Oxford Chapters 9–10
- Dominion of New Zealand . Census of Population vi – vi . cf. map following