SONGEL JUAN MARIA. (2010). CONVERSATION WITH FREI OTTO. PRINCETON ARCHITECTURAL PRESS/NEW YORK.
Cita Chicago (17th ed.)SONGEL JUAN MARIA. CONVERSATION WITH FREI OTTO. PRINCETON ARCHITECTURAL PRESS/NEW YORK, 2010.
Cita MLA (9th ed.)SONGEL JUAN MARIA. CONVERSATION WITH FREI OTTO. PRINCETON ARCHITECTURAL PRESS/NEW YORK, 2010.
Atenció: Aquestes cites poden no estar 100% correctes.