Licup, N. L. (1978). Children's ability to coordinate perspectives of isolated objects: Implications for science curriculum development.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Licup, Nora Librado-. Children's Ability to Coordinate Perspectives of Isolated Objects: Implications for Science Curriculum Development. 1978.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Licup, Nora Librado-. Children's Ability to Coordinate Perspectives of Isolated Objects: Implications for Science Curriculum Development. 1978.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.