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