the "source" is your capx file.
Sounds like you were given a project and are supposed to code things yourself. If so I highly recommend doing your school work the way your teacher/professor intended.
Otherwise, Construct does not make it easy to read the code. This is to help protect developers from those that would steal their code.
That said, when you are in the home menu there is an export button. That will export into a working although non(humanly) readable code.