Jagadisan, S., and T. Fookes. “Antecedents for the Ekistic Grid and the Anthropocosmos Model: A Critical View of Ekistic Methodology”. Ekistics and The New Habitat, vol. 73, no. 436-441, Dec. 2006, pp. pp. 265-276, http://ekisticsjournal.org/index.php/journal/article/view/123.