Ash, K. M. (1994). Miracles Happen: The Life and Timeless Principles of the Founder of Mary Kay Inc (3rd.). HarperCollins.
Citazione stile Chigago Style (17a edizione)Ash, Kay Mary. Miracles Happen: The Life and Timeless Principles of the Founder of Mary Kay Inc. 3rd. New York: HarperCollins, 1994.
Citatione MLA (9a ed.)Ash, Kay Mary. Miracles Happen: The Life and Timeless Principles of the Founder of Mary Kay Inc. 3rd. HarperCollins, 1994.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.