142-145, available online* Dinsmoor, William Bell (1922), "Structural Iron in Greek Architecture," "American Journal of Archaeology," XXVI* Dinsmoor, W. B., "The Architecture of Ancient Greece" (New York, 1975 - but actually a reprint of the 1950 publication).
* Darling, Janina K.; "Architecture of Greece", 2004, Greenwood Publishing Group, ISBN 0313321523, 9780313321528, google books - good account of the Athens Propileje on pp.