1. Before you flip, consider this;Bergmann;Phi Delta Kappan,2012
2. Flip your classroom: Reach every student in every class every day;Jonathan,2012
3. The Rise of Women: The Growing Gender Gap in Education and What it Means for American Schools;DiPrete,2013
4. Evaluation of a flipped classroom in an undergraduate business course;Findlay-Thompson;Bus. Educ. Accredit.,2014
5. Guo, P., 2013. Optimal video length for student engagement. Available at: https://www.edx.org/blog/optimal-video-length-student-engagement#.U87o8LEn86E.