How do I format my study guide for my Family Medicine rotation, with 20 references and a tight 72-hour deadline?

I'm a third-year medical resident in Family Medicine, and my study guide is due in 72 hours for our upcoming board exam prep. I've been researching online for APA style guides, but the formatting requirements are overwhelming - I have 20 references to include, and I'm worried about not meeting the formatting standards. I've tried using citation generators like Zotero, but they're not producing the exact APA headers I need, and I need help deciding how to organize my content and cite my sources in the most efficient way possible. I have a limited budget, so free online resources and open-source tools are a must, and I'd appreciate any advice on the best way to complete this study guide on short notice.