How do you find nanny? Through nanny service agent or referral?

We hired a night nanny for our daughter for 2 months. Besides caring for her at night so I get to catch up on sleep, her purpose is to help sleep train our baby and get her on a normal night schedule. I found her through online recommendations. She's excellent and I would HIGHLY recommend her. She came at 10pm and left at 7 am. Her name is nanny Saro and you can find her online through her website. (Ps she's a trained nurse as well)