Lua APA (7ú heag.)
Otto, F., & Songel, J. M. (2010). A conversation with Frei Otto (English ed.). Princeton Architectural Press.
Lua i Stíl Chicago (17ú heag.)
Otto, Frei, agus Juan María Songel. A Conversation with Frei Otto. English ed. New York: Princeton Architectural Press, 2010.
Lua MLA (9ú heag.)
Otto, Frei, agus Juan María Songel. A Conversation with Frei Otto. English ed. Princeton Architectural Press, 2010.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.