For details about citing information you have learned from "personal communications" like interviews you personally conducted, emails, and class seminars, see the below tutorial from APA's Academic Writer.
Media
Personal Communications
Learn how to cite personal communications, including emails, classroom lectures, personal interviews, text messages, letters, and telephone conversations, as well as how to cite or discuss other types of interviews, such as recoverable interviews or research participant interviews that serve as a data source for your study.
Academic Writer
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