For books about sports psychology, try using terms such as
Sports -- Psychological aspects.
Sports -- psychology.
Coaching (Athletics)
Motivation (Psychology)
Athletes -- Counseling of.
Athletes -- Mental health.
SPORTDiscus is the most comprehensive source of Sports & Sports Medicine journals.
ERIC (Education Resources Information Center) is the leading online library for education research and information. Sponsored by the U.S. Department of Education, ERIC covers all aspects of education, from early childhood to post-secondary education.