Non-Gonococcal Urethritis (NGU)
Here's your citation in American Psychological Association (APA) format:
Non-Gonococcal Urethritis (NGU). (n.d.). In Alleydog.com's online glossary. Retrieved from: https://www.alleydog.com/glossary/definition-cit.php?term=Non-Gonococcal+Urethritis+%28NGU%29