Pertuch, A. R. (1909). German schlagball (German bat-ball): A game of ball described in four grades of difficulty. J.J. McVey.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Pertuch, Albert Richard. German Schlagball (German Bat-ball): A Game of Ball Described in Four Grades of Difficulty. Philadelphia, Pa.: J.J. McVey, 1909.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Pertuch, Albert Richard. German Schlagball (German Bat-ball): A Game of Ball Described in Four Grades of Difficulty. J.J. McVey, 1909.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.