The APA 7th edition publication manual provides guidance on how to reference documents that are in electronic form but are not from a published journal. This category is called Gray Literature. Gray literature includes electronic articles that are accessed on a web page (but are distinct from the web page) or which are downloaded as a PDF (portable document format). Examples are reports, press releases, codes of ethics and other government or agency documents. School documents, including curriculum documents, can be referenced in this category.
In-text reference
(Center on the Developing Child, 2017)
OR
Reference list
Author, A. A. (1998). Title of work [Description]. Publisher. https://www.xxxxxx
This example references a PDF document downloaded from the CDC website.