Final answer:
A nurse would consult a quick reference guide to learn the correct placement of EKG leads.
Step-by-step explanation:
When a nurse is unfamiliar with the placement of EKG leads, they would consult a quick reference guide to learn the correct placement. A quick reference guide provides a visual representation of the correct placement of the electrodes on the patient's body. This guide helps ensure accurate readings and interpretation of the EKG signals.