Columbia subject headings:
Direct action--Handbooks, manuals, etc.
Political participation--Handbooks, manuals, etc.
Social change--Handbooks, manuals, etc.
Harvard subject headings:
Direct action--Handbooks, manuals, etc.
Political participation--Handbooks, manuals, etc.
Social change--Handbooks, manuals, etc.
Princeton subject headings:
Direct action--Handbooks, manuals, etc.