Cottrell, R. C. (2006). Smokejumpers of the Civilian Public Service in World War II: Conscientious objectors as firefighters for the National Forest Service. McFarland & Co..
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Cottrell, Robert C. Smokejumpers of the Civilian Public Service in World War II: Conscientious Objectors as Firefighters for the National Forest Service. Jefferson, N.C.: McFarland & Co., 2006.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Cottrell, Robert C. Smokejumpers of the Civilian Public Service in World War II: Conscientious Objectors as Firefighters for the National Forest Service. McFarland & Co., 2006.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.