APA (7th ed.) Citation

Burridge, J. D., Peggs, K., & Smart, B. (2013). Observation methods. SAGE Publications.

Chicago Style (17th ed.) Citation

Burridge, Joseph D., Kay Peggs, and Barry Smart. Observation Methods. Thousand Oaks, California: SAGE Publications, 2013.

MLA (9th ed.) Citation

Burridge, Joseph D., et al. Observation Methods. SAGE Publications, 2013.