https://leifhallberg.com/home/resources/research/

"...a comprehensive review of research articles on equine-assisted activities & therapies published between 1985-2016 was conducted using fourteen databases including PsycINFO, PsycARTICLES, PubMed, CAB Abstracts, Psychiatric Online, Psychological and Behavioral Sciences Collection, the Social Sciences Citation Index, Nursing & Allied Health Collection, Physical Therapy and Sports Medicine Collection, EBSCO Academic Search, EBSCO SPORTDiscus, EBSCO Educational Research Complete, EBSCO HealthSource, and VetMed."