Ovalle-Castiblanco, A. M., & Cárdenas-Aguirre, D. M. (2016). What happened with the application of time and motion study in the last two decades?: Review of the literature. Universidad Pedagógica y Tecnológica de Colombia - UPTC.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Ovalle-Castiblanco, Alex Mauricio, و Diana María Cárdenas-Aguirre. What Happened with the Application of Time and Motion Study in the Last Two Decades?: Review of the Literature. Universidad Pedagógica y Tecnológica de Colombia - UPTC, 2016.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Ovalle-Castiblanco, Alex Mauricio, و Diana María Cárdenas-Aguirre. What Happened with the Application of Time and Motion Study in the Last Two Decades?: Review of the Literature. Universidad Pedagógica y Tecnológica de Colombia - UPTC, 2016.