How do I get a referral from working there? How do I know if I am rehirable? Who do I speak in reference to or give contact to my applications?

Call and ask

You basically just hound the place down just kidding just be persistent and phone calls and also physical appearance get the email exactly of the person who hires you or was working there at the time and with that you can start pursuing getting your job back and to know if you're reliable is if you didn't get either fired or bad attendance