Cooke, Todd J; Poli, DorothyBelle; Cohen, Jerry D (2003). "Did auxin play a crucial role in the evolution of novel body plans during the Late Silurian-Early Devonian radiation of land plants?". The Evolution of Plant Physiology. Elsevier. pp. 85–107. doi:10.1016/b978-012339552-8/50006-8. ISBN978-0-12-339552-8.