Unell, B. (1995). 20 teachable virtues: Practical ways to pass on lessons of virtue and character to your children. A Perigee Book.
Citace podle Chicago (17th ed.)Unell, Barbara. 20 Teachable Virtues: Practical Ways to Pass on Lessons of Virtue and Character to Your Children. New York: A Perigee Book, 1995.
Citace podle MLA (9th ed.)Unell, Barbara. 20 Teachable Virtues: Practical Ways to Pass on Lessons of Virtue and Character to Your Children. A Perigee Book, 1995.
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