Cita APA (7th ed.)
Otto, F., & Songel, J. M. (2010). A conversation with Frei Otto (English ed.). Princeton Architectural Press.
Cita Chicago (17th ed.)
Otto, Frei, i Juan María Songel. A Conversation with Frei Otto. English ed. New York: Princeton Architectural Press, 2010.
Cita MLA (9th ed.)
Otto, Frei, i Juan María Songel. A Conversation with Frei Otto. English ed. Princeton Architectural Press, 2010.
Atenció: Aquestes cites poden no estar 100% correctes.