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