<p>Ibid., p. 38.</p>

<p>Ibid.</p>

<p>Ibid.</p>

<p>Ibid., p. 340.</p>

<p>Ibid., p. 334.</p>

<p>Wheeler, op. cit., p. 336.</p>

<p>Boserup, op. cit., pp. 87-89.</p>

<p>Wheeler, op. cit., p. 320.</p>

<p>Boserup, op. cit., pp. 182-183.</p>

<p>Mead, Male and Female, p. 229.</p>