- Brownlee, David B. "Adventures of Unexplored Places." In Brownlee and David G. DeLong, Louis I. Kahn: In the Realm of Architecture. New York: Rizzoli, 1991. Pp. 25, 26.
- Lewis, Michael J. "Kahn's Graphic Modernism." In Lewis and Eugene J. Johnson. Drawn from the Source: The Travel Sketches of Louis I. Kahn. Cambridge, MA: MIT Press, 1996. Pp. 15-16, 125n.
- LIK Box 57, "Passport" folder, Louis I. Kahn Collection, the University of Pennsylvania and Pennsylvania Historical and Museum Commission, held at the Architectural Archives of the University of Pennsylvania, Philadelphia.
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