Ken Yeang, "Progetto verde: teoria e pratica/The Ecological (or green) approach to Design", EcoEnea 8 (supplemento a/supplement to L'Arca 148, maggio/may 2000), p. 2-15"Roof-Roof House, 1984", EcoEnea 8 (supplemento a/supplement to L'Arca 148, maggio/may 2000), p. 2 (2-15)