APA (7th ed.) Citation

Campbell, R. L., & Langford, R. E. (1995). Substance abuse in the workplace. Lewis Publishers.

Chicago Style (17th ed.) Citation

Campbell, Reginald L., and Roland E. Langford. Substance Abuse in the Workplace. Boca Raton, Fla.: Lewis Publishers, 1995.

MLA (9th ed.) Citation

Campbell, Reginald L., and Roland E. Langford. Substance Abuse in the Workplace. Lewis Publishers, 1995.