Hi Bp,
I am also self-employed.
I asked one of my client, the president of a company I often work with (which could also be a supplier in your case), and my mentor/advisor (somebody that did an mba and started a business also).
In my case I never had a supervisor so it was even harder than you, I think a client and your former supervisor should be good, use the mentor as a third one if you need it.
Cheers,
A.
Self-employer, whom should I get recommendations from?
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