Klaus, M. H., Kennell, J. H., & Klaus, P. H. (2012). The doula book: How a trained labor companion can help you have a shorter, easier, and healthier birth (3rd ed.). Lifelong Books/Da Capo Press.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Klaus, Marshall H., John H. Kennell, و Phyllis H. Klaus. The Doula Book: How a Trained Labor Companion Can Help You Have a Shorter, Easier, and Healthier Birth. 3rd ed. Boston, MA: Lifelong Books/Da Capo Press, 2012.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Klaus, Marshall H., et al. The Doula Book: How a Trained Labor Companion Can Help You Have a Shorter, Easier, and Healthier Birth. 3rd ed. Lifelong Books/Da Capo Press, 2012.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.