APA (7th ed.) Citation

Blackwell, W. R., & Milligan, J. W. (1976). The Garland Urban Observatory as a case study in urban extension. Garland Urban Observatory.

Chicago Style (17th ed.) Citation

Blackwell, William R., and John W. Milligan. The Garland Urban Observatory as a Case Study in Urban Extension. [Garland, Tex.]: Garland Urban Observatory, 1976.

MLA (9th ed.) Citation

Blackwell, William R., and John W. Milligan. The Garland Urban Observatory as a Case Study in Urban Extension. Garland Urban Observatory, 1976.