Some videos from external sources:
"Academic research and writing – Chapter 1 Foundations – Unit 4 Philosophical considerations" by Prof. Dr. Christian Decker
http://youtube.com/watch?v=uXaDtT7r0gc
"The philosophical method - logic and argument" by Oxford University Department for Continuing Education
http://youtube.com/watch?v=M14ReHfPFUw
"MBA Quantitative Research Methods (Part 1 of 4)" by Regenesys Business School
http://youtube.com/watch?v=aBvShB2kd5c
Other videos on Mathematics:
"The surprising beauty of mathematics | Jonathan Matte | TEDxGreensFarmsAcademy" by TEDx Talks
https://www.youtube.com/watch?v=SEiSloE1r-A
"Why most people are bad at mathematics - Neil deGrasse Tyson asks Richard Dawkins" by Cosmology Today™
https://www.youtube.com/watch?v=fbrQ8F-LQNs
"Mathematics is the queen of Sciences" by Srivathsa Joshi
https://www.youtube.com/watch?v=8mve0UoSxTo
"The History Of Numbers And Mathematics The Story Of 1 One Documentary BBC Documentary Chan"
https://www.youtube.com/watch?v=09l2nR3knYk
"Algebra and Mathematics. Explained with easy to understand 3D animations." by Physics Videos by Eugene Khutoryansky
https://www.youtube.com/watch?v=MJYsXGbxueY
"Lec 3 | MIT 18.02 Multivariable Calculus, Fall 2007" by MIT OpenCourseWare
https://www.youtube.com/watch?v=bHdzkFrgRcA