APA (7th ed.) Citation

Westheimer, P. H., & Nelson, R. B. (1990). The perfect letter. Scott, Foresman.

Chicago Style (17th ed.) Citation

Westheimer, Patricia H., and Robert B. Nelson. The Perfect Letter. Glenview, IL: Scott, Foresman, 1990.

MLA (9th ed.) Citation

Westheimer, Patricia H., and Robert B. Nelson. The Perfect Letter. Scott, Foresman, 1990.