APA (7th ed.) Citation

Wilby, C. B., & Khwaja, I. (1977). Concrete shell roofs. Applied Science Publishers.

Chicago Style (17th ed.) Citation

Wilby, C. B., and I. Khwaja. Concrete Shell Roofs. London: Applied Science Publishers, 1977.

MLA (9th ed.) Citation

Wilby, C. B., and I. Khwaja. Concrete Shell Roofs. Applied Science Publishers, 1977.