- [8:59 min, E, YouTube: Class Responsibility Collaboration](https://www.youtube.com/watch?v=mbpeonZUhpU)
- [11:06 min, E, YouTube: CRC Card Analysis Example](https://www.youtube.com/watch?v=otKUer13HnA)
- [8:39 min, E, YouTube: How to make CRC 'class responsibility collaborations' cards - explained with example](https://www.youtube.com/watch?v=59tkQ-FwcpA)