1. Chapter 3, Beams: Strain, Stress, Deflections, http://courses.washington.edu/me354a/.
2. Chapter_5-98, Stresses in Beam (Basic Topics), https://ocw.nthu.edu.tw/.
3. Chapter 9, Stresses: Beams in Bending, ocw.mit.edu-1-050-solid-mechanics.
4. Lecture Notes on Mechanics of Solids, https://nitsri.ac.in/. Mechanical Department.
5. Units of Elastic Constants. www.lkouniv.ac.in.