APA (7th ed.) Citation

Welch, T. J., Potchen, E. J., & Welch, M. J. (1972). Fundamentals of the tracer method. Saunders.

Chicago Style (17th ed.) Citation

Welch, Teresa J., Edward James Potchen, and Michael J. Welch. Fundamentals of the Tracer Method. Philadelphia: Saunders, 1972.

MLA (9th ed.) Citation

Welch, Teresa J., et al. Fundamentals of the Tracer Method. Saunders, 1972.