Gale, F., Koestler, Robert J., Charola, A. Elena, and Weiss, N. R. 1987. "Exterior masonry cleaning at Saint Thomas Church New York, New York." in Proceedings of the Fourth North American Masonry Conference Volume 2, edited by Hart, G. C., Englekirk, R., and Kariotis, J., 1–13. Los Angeles: UCLA.