Columbia subject headings:
Medicine--Research--Case studies.
Physics--Research--Case studies.
Psychiatry--Research--Case studies.
Research--Methodology.
Harvard subject headings:
Case studies
Medicine--Research--Case studies.
Physics--Research--Case studies.
Psychiatry--Research--Case studies.
Research--Methodology
Princeton subject headings:
Medicine--Research--Case studies.
Physics--Research--Case studies.
Psychiatry--Research--Case studies.
Research--Methodology.