APA (7th ed.) Citation

Weekes, H. N., & Duller, N. M. (1972). An adaptable system of classroom observation.

Chicago Style (17th ed.) Citation

Weekes, Helen Nyquist, and Nelson M. Duller. An Adaptable System of Classroom Observation. [College Station, Tex.], 1972.

MLA (9th ed.) Citation

Weekes, Helen Nyquist, and Nelson M. Duller. An Adaptable System of Classroom Observation. 1972.