Henkel, P. (1811). The first chief head of the Christian catechism: For the instruction of youth in the knowledge of the Christian religion, together with morning and evening hymns, and prayers. Ambrose Henkel.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Henkel, Paul. The First Chief Head of the Christian Catechism: For the Instruction of Youth in the Knowledge of the Christian Religion, Together with Morning and Evening Hymns, and Prayers. New-Market [Va.]: Ambrose Henkel, 1811.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Henkel, Paul. The First Chief Head of the Christian Catechism: For the Instruction of Youth in the Knowledge of the Christian Religion, Together with Morning and Evening Hymns, and Prayers. Ambrose Henkel, 1811.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.