One of the easiest ways to keep track of your sources is to cite as you go. EndNote is a program that current UK staff, faculty, and students can download for free to help you do just that and more.
EndNote features include the following:
The EndNote Guide provides more detailed information.
Selected citation applications.
This short, self-paced free tutorial from APA takes you through the basics of APA Style 7th edition.
The books below may be helpful as well.