Cita APA (7a ed.)

Elson, M. J., Walker, S., & Macdonald, R. (1993). The effectiveness of green belts. HMSO.

Cita Chicago Style (17a ed.)

Elson, Martin J., Stephen Walker, y Roderick Macdonald. The Effectiveness of Green Belts. London: HMSO, 1993.

Cita MLA (9a ed.)

Elson, Martin J., et al. The Effectiveness of Green Belts. HMSO, 1993.