Columbia subject headings:
Police patrol--Handbooks, manuals, etc.
Police services for juveniles--Handbooks, manuals, etc.
Harvard subject headings:
Police patrol--Handbooks, manuals, etc.
Police services for juveniles--Handbooks, manuals, etc.
Princeton subject headings:
Police patrol--Handbooks, manuals, etc.
Police services for juveniles--Handbooks, manuals, etc.