Do all of my sources need to be scholarly peer-reviewed articles? If your sources do not need to be scholarly peer-reviewed, then you may be referring to grey literature.
Grey literature is material that is unpublished or has been published outside of the typical commercial or academic publishing environment.
Examples of grey literature include:
From California State University, Fullerton. Their research guide has more information about grey literature.
From Western University Libraries. Grey Literature YouTube video tutorial w/script.
Grey Literature Report: Fill the gaps in your Public Health Research from the New York Academy of Medicine (What is Grey Literature?)
CDC WONDER makes the information resources of the Centers for Disease Control and Prevention (CDC) available to public health professionals and the public at large. It provides access to a wide array of public health information.