APA (7th ed.) Citation

Roland, C., & Amerongen, C. V. (1965). Frei Otto - structures. Longman Group.

Chicago Style (17th ed.) Citation

Roland, Conrad, and C. V. Amerongen. Frei Otto - Structures. London: Longman Group, 1965.

MLA (9th ed.) Citation

Roland, Conrad, and C. V. Amerongen. Frei Otto - Structures. Longman Group, 1965.