Below you will find research that I have gathered from well-accredited sources in the research field. There is research to support the statements said on the main page, as well as research to support other statements you may have heard about doulas. As with all birth-related topics, I encourage you to explore the research yourself and come to your own conclusion.
Evidence Based Birth is a website that has an enormous amount of research on birth. I highly recommend looking into it.
Another website that has a beautiful collection of research and information is Mama Glow. They have webinars and many articles related to every aspect of birth.