Reference management software (citation managers) can help you group your sources all in one place as you do your research. You can use them to create citations, store PDFs, and/or import them into your papers.
Mendeley and Zotero are free to download, and you can make free cloud accounts up to 2GB (Zotero lets you use less memory for free). All citation managers take some time to learn. Georgia State University has library guides on how to get started on each.
Concordia also provides access to APA Academic Writer, which is made up of 3 sections:
It will be most useful to you if you spend time learning how APA Academic Writer functions before you get deep into your dissertation process. To get started, under Learn, click on "Quick Guides" and look at:
Basic Paper Setup (We do not recommend using a "running head" in university papers)
Reference Work and Entry in a Reference Work Reference
Tutorials cover similar materials but are longer. Sample papers may be useful for examples.