APA (7th ed.) Citation

Gladwell, M. (1999). The tipping point: How little things can make a big difference. Dell Laurel-Leaf.

Chicago Style (17th ed.) Citation

Gladwell, Malcolm. The Tipping Point: How Little Things Can Make a Big Difference. New York: Dell Laurel-Leaf, 1999.

MLA (9th ed.) Citation

Gladwell, Malcolm. The Tipping Point: How Little Things Can Make a Big Difference. Dell Laurel-Leaf, 1999.