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2.
R. Good, 'Intelligence and Attainment in Rhodesia', Oversea Education , 1956.
3.
S. Biesheuvel and R. Liddicoat, 'The Effects of Cultural Factors on Intelligence Test Performance', Journal of the National Institute for Personnel Research, 8, 1959 , pp. 3-14.
4.
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5.
P.J.M. McEwan, White Rhodesians, a Psycho-Social Study of a Colony. In preparation.
6.
S. Biesheuvel, 'The Nation's Intelligence and Its Measurement', South African Journal of Science,39, 1952, p. 131.
7.
H.P. Langenhoven, 'A Note on the Effects of Cultural Factors on Intelligence Test Performance' , Journal of the National Institute for Personnel Research , 8, 1960, pp. 151-2.
8.
J. Loevinger, 'Intelligence as Related to Socio-Economic Factors'39th Yearbook of the National Society for the Study of Education, Illinois, 1940, pp. 159-210.
9.
Q. McNemar, 'A Critical Examination of the University of Iowa Studies of Environmental Influences upon the I.Q.', Psychological Bulletin, 37, 2.
10.
S.F. Markham, Climate and the Energy of Nations (London, Oxford University Press, 1942).
11.
C.A. Mills, Medical Climatology (Springfield, Ill., Charles C. Thomas, 1939).
12.
P. Morkel, 'The A(G) Mental Alertness Tests: the Reliability, Difficulty and Grading of the Forms'. M. A. thesis, University of Stellenbosch , 1950.
13.
'Intelligence: its Nature and Nurture. Part I: Comparative and Critical Exposition. Part II: Original Studies and Experiments', 39th Yearbook of the National Society for the Study of Education, Illinois, 1940.
14.
E. Pratt-Yule and R.C. Albino, 'A Survey of the Intelligence of the Southern Rhodesian School Population' , Proceedings of the South African Psychological Association. 1, 1950, pp. 13-14.
15.
A.G. Price, White Settlers in the Tropics, Special Publication No. 23 of the American Geographical Society, 1939.