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