PowerPoint slides are the visual aid to your presentation, not the presentation itself. Make them clear and interesting.
Further slide tips:
You can make your excel charts more attractive by removing chart "junk". Here's how:
You can find more slide tips from Garr Reynolds at http://www.garrreynolds.com/preso-tips/design/
Use the format you know best, such as APA or MLA. If you use a citation manager like Refworks (available through UMassMed), Mendeley, or Zotero (both are free), the software will format your citations for you. To check the formatting or if you want to do it by hand, the Purdue OWL has extensive guides for APA and MLA formats.
The best technique for citing references in your slides is outlined in these attribution guidelines.
Paletton is a great tool for choosing a color scheme and testing out a scheme for different gradients of vision.
Another great resource for public health images besides Google Images is the Public Health Image Library.
Just remember your ABC's-- be Audible, be Brief, and Connect with your audience.