Adrenergic System / Adrenergic Nervous System (ANS)
Here's your citation in American Psychological Association (APA) format:
Adrenergic System / Adrenergic Nervous System (ANS). (n.d.). In Alleydog.com's online glossary. Retrieved from: https://www.alleydog.com/glossary/definition-cit.php?term=Adrenergic+System+%2F+Adrenergic+Nervous+System+%28ANS%29