Cita APA (7a ed.)

Open University, Mercer, D., & Barratt, R. (1992). Managing the external environment: A strategic perspective. Sage [etc.].

Cita Chicago Style (17a ed.)

Open University, David Mercer, y Rod Barratt. Managing the External Environment: A Strategic Perspective. London [etc.]: Sage [etc.], 1992.

Cita MLA (9a ed.)

Open University, et al. Managing the External Environment: A Strategic Perspective. Sage [etc.], 1992.