• Levy, E. B. & Madden, E. A. (1933). The point method of pasture analysis. N.Z. J. Agric., 46, 26779.
  • Tinney, F. W., Aamodt, O. S. & Ahlgren, H. L. (1937). Preliminary report of a study on methods used in botanical analyses of pasture swards. J. Amer. Soc. Agron., 29, 83540.
  • Vankeuren, R. W. & Ahlgren, H. L. (1957). A statistical study of several methods used in determining the botanical composition of a sward. I. A study of established pastures. Agron. J., 49, 5326.
  • Warren Wilson, J. (1959). Analysis of the spatial distribution of foliage by two-dimensional point quadrats. New Phytol., 58, 92101.
  • Winkworth, R. E. (1955). The use of point quadrats for the analysis of heathland. Aust.J. Bot., 3, 6881.