Larson, Doug W., Uta Matthes, Peter E. Kelly, Jeremy Lundholm, and John A. Gerrath. “The Urban Cliff Hypothesis and Its Relevance to Ekistics”. Ekistics and The New Habitat 71, no. 424-426 (June 1, 2004): pp. 76–82. Accessed April 25, 2024. https://ekisticsjournal.org/index.php/journal/article/view/228.