John-Roger & McWilliams, P. (1991). You can't afford the luxury of a negative thought: Book for people with any life-threatening illness including life. Ms. Rowan.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)John-Roger و Peter McWilliams. You Can't Afford the Luxury of a Negative Thought: Book for People with Any Life-threatening Illness Including Life. Los Angeles: Ms. Rowan, 1991.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)John-Roger و Peter McWilliams. You Can't Afford the Luxury of a Negative Thought: Book for People with Any Life-threatening Illness Including Life. Ms. Rowan, 1991.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.