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Parsons Talcott . Article “Maltbus” in encycl. of the social sciences, 1933.

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Ricardo D. principles of political economy and taxation, 1821, p. 52.

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Marshall Alfred . principles of economics, 1890. Book II, Ch. III, $3-4.

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Benham F. economics, 1938, p. 43.

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Hobhouse L. T. social development, 1924, p. 104.

Hobhouse L. T. the elements of social justice, 1922, pp. 100–110.

Durkheim E. elementary forms of the religious life (English Edition, 1926).

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Rowntree B. Seebohm . poverty—a study of town life, 1908. Ch. IV.

Rowntree B. Seebohm . poverty and progress, 1941, p. 102.

Webb S. Webb B. industrial democracy, 1898, pp. 693–7.

Malinowski Bronislaw . a scientific theory of culture, 1944. This contains the full statement of Malinowski's theory. Shorter versions are to be found in his article on Culture in the encycl. soc. sci., 1933; and in his freedom and civilisation, 1947, pt. IV.

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McLester J. S. nutrition and diet, 1943, p. 86.

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Orr J. Boyd . food, health and income, 1937, p. 7.