Some of you already may have learned APA style using the 4th edition. In my estimation, these changes only minimally affect the papers and reports written in this class.

APA has a website that highlights the changes since the 4th edition:

The changes that I believe merit remark are as follows (I'll update as needed):

Where underlining once was used (e.g., journal titles, subheadings, statistical abbreviations), italics now are used.

Indenting for references has returned to the 3rd edition. The first line of each reference is flush left, and each subsequent line is indented five spaces.