Cita APA (7th ed.)

Open University, Johnson, J., & Slater, R. (1993). Ageing and later life. Sage Publications.

Cita Chicago (17th ed.)

Open University, Julia Johnson, i Robert Slater. Ageing and Later Life. London ; Thousand Oaks, Calif.: Sage Publications, 1993.

Cita MLA (8th ed.)

Open University, et al. Ageing and Later Life. Sage Publications, 1993.