APA (7th ed.) Citation

Sapsford, R. J., Evans, Jeff, & Open Universtiy. (1979). Evaluation of research. Open Universtiy Press.

Chicago Style (17th ed.) Citation

Sapsford, R. J., Jeff Evans, and Open Universtiy. Evaluation of Research. Milton Keynes: Open Universtiy Press, 1979.

MLA (9th ed.) Citation

Sapsford, R. J., et al. Evaluation of Research. Open Universtiy Press, 1979.