Negative Affect Syndrome %28NAS%29
Here's your citation in American Psychological Association (APA) format:
Negative Affect Syndrome %28NAS%29. (n.d.). In Alleydog.com's online glossary. Retrieved from: https://www.alleydog.com/glossary/definition-cit.php?term=Negative+Affect+Syndrome+%2528NAS%2529