DiFillippo, S. (2013). It's all about the guest: Exceeding expectations in business and in life, the Davio's way. Lyons Press.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)DiFillippo, Steve. It's All About the Guest: Exceeding Expectations in Business and in Life, the Davio's Way. Guilford, Connecticut: Lyons Press, 2013.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)DiFillippo, Steve. It's All About the Guest: Exceeding Expectations in Business and in Life, the Davio's Way. Lyons Press, 2013.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.