APA (7th ed.) Citation

Harvey, J., & Bather, L. (1972). The British constitution (3rd ed.). MacMillan [etc.].

Chicago Style (17th ed.) Citation

Harvey, J., and L. Bather. The British Constitution. 3rd ed. London [etc.]: MacMillan [etc.], 1972.

MLA (9th ed.) Citation

Harvey, J., and L. Bather. The British Constitution. 3rd ed. MacMillan [etc.], 1972.