APA (7th ed.) Citation

Elrick, H., Crakes, J., & Clarke, S. J. (1978). Living longer and better: Guide to optimal health. World Publications.

Chicago Style (17th ed.) Citation

Elrick, Harold, James Crakes, and Samuel J. Clarke. Living Longer and Better: Guide to Optimal Health. Mountain View, CA: World Publications, 1978.

MLA (9th ed.) Citation

Elrick, Harold, et al. Living Longer and Better: Guide to Optimal Health. World Publications, 1978.