APA (7th ed.) Citation

Ormrod, R., Walker, H., & Ellison, J. H. (1950). The National Health Service. Butterworth.

Chicago Style (17th ed.) Citation

Ormrod, Roger, Harris Walker, and John H. Ellison. The National Health Service. London: Butterworth, 1950.

MLA (9th ed.) Citation

Ormrod, Roger, et al. The National Health Service. Butterworth, 1950.