USDLA & Fischler School of Education and Human Services. Distance learning: For educators, trainers, and leaders. Information Age Pub.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)USDLA و Fischler School of Education and Human Services. Distance Learning: For Educators, Trainers, and Leaders. Greenwich, Conn.: Information Age Pub.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)USDLA و Fischler School of Education and Human Services. Distance Learning: For Educators, Trainers, and Leaders. Information Age Pub.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.