APA (7th ed.) Citation

Sandford, C. E. (1990). Enjoy sex in the middle years (Rev. ed.). Optima in association with Relate.

Chicago Style (17th ed.) Citation

Sandford, Christine E. Enjoy Sex in the Middle Years. Rev. ed. London: Optima in association with Relate, 1990.

MLA (8th ed.) Citation

Sandford, Christine E. Enjoy Sex in the Middle Years. Rev. ed. Optima in association with Relate, 1990.