Lederer, R. J. (2016). Beaks, bones, and bird songs: How the struggle for survival has shaped birds and their behavior. Timber Press.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Lederer, Roger J. Beaks, Bones, and Bird Songs: How the Struggle for Survival Has Shaped Birds and Their Behavior. Portland, Oregon: Timber Press, 2016.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Lederer, Roger J. Beaks, Bones, and Bird Songs: How the Struggle for Survival Has Shaped Birds and Their Behavior. Timber Press, 2016.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.