Bethancourt, M., & Eck, P. (1971). A selected bibliography of print and non print media in the audiovisual field. Bureau of Educational Research and Services, Arizona State University.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Bethancourt, Marcella, و Pamelia Eck. A Selected Bibliography of Print and Non Print Media in the Audiovisual Field. Tempe, Arizona: Bureau of Educational Research and Services, Arizona State University, 1971.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Bethancourt, Marcella, و Pamelia Eck. A Selected Bibliography of Print and Non Print Media in the Audiovisual Field. Bureau of Educational Research and Services, Arizona State University, 1971.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.