Covey, S. R. (1999). 7 habbit of highly effective families: Building a beautifu family culture in a turbulant world.
استشهاد بنمط شيكاغوCovey, Stephen R. 7 Habbit of Highly Effective Families: Building a Beautifu Family Culture in a Turbulant World. Simon & Schuster, 1999.
MLA استشهادCovey, Stephen R. 7 Habbit of Highly Effective Families: Building a Beautifu Family Culture in a Turbulant World. 1999.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.