Please read the case study and reading materials. There is no minimum no of reference.
Lecture Recordings:
https://www.youtube.com/watch?v=r8LHfMnwf8I&feature=youtu.be

https://www.youtube.com/watch?v=S7M-4FPHU7Q

https://www.youtube.com/watch?v=ey401Q7HD54&feature=youtu.be

https://www.youtube.com/watch?v=su-IWAqbGHo&feature=youtu.be