Ertl, B. (2010). Technologies and practices for constructing knowledge in online environments: Advancements in learning. Information Science Reference.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Ertl, Bernhard. Technologies and Practices for Constructing Knowledge in Online Environments: Advancements in Learning. Hershey, PA: Information Science Reference, 2010.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Ertl, Bernhard. Technologies and Practices for Constructing Knowledge in Online Environments: Advancements in Learning. Information Science Reference, 2010.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.