APA (7th ed.) Citation

Ziglar, Z. (1987). Top performance: How to develop excellence in yourself & others. A Berkeley Book.

Chicago Style (17th ed.) Citation

Ziglar, Zig. Top Performance: How to Develop Excellence in Yourself & Others. New York: A Berkeley Book, 1987.

MLA (8th ed.) Citation

Ziglar, Zig. Top Performance: How to Develop Excellence in Yourself & Others. A Berkeley Book, 1987.