APA (7th ed.) Citation

Ziglar, Z. (1984). Zig Ziglar's secrets of closing the sale. Berkley Books.

Chicago Style (17th ed.) Citation

Ziglar, Zig. Zig Ziglar's Secrets of Closing the Sale. New York: Berkley Books, 1984.

MLA (9th ed.) Citation

Ziglar, Zig. Zig Ziglar's Secrets of Closing the Sale. Berkley Books, 1984.

Warning: These citations may not always be 100% accurate.