<nowiki>Willem Koops; Willem Koops; Willem Koops; Willem Koops; Willem Koops; Willem Koops; Willem Koops; Willem Koops; Willem Koops; Willem Koops; Willem Koops; Willem Koops; Willem Koops; Willem Koops; Willem Koops; Willem Koops; Willem Koops; Willem Koops; Willem Koops; Willem Koops; Willem Koops; Willem Koops; Willem Koops; Willem Koops; Willem Koops; Willem Koops; Willem Koops; Willem Koops; Willem Koops; Willem Koops; Willem Koops; Willem Koops; psicólogo neerlandés; عالم نفس هولندي; Dutch psychologist; Dutch psychologist; Dutch psychologist; Nederlands psycholoog; W. Koops; W. Koops</nowiki>