The Library Catalog and WorldCat are the two most important places to search for books and recent publications.
Sample Subject Headings to use:
Nineteen Sixties
Nineteen sixty-eight, A.D. Cross-cultural studies
Protest Movements Europe Cross-cultural studies
Social change Europe Cross cultural studies
Europe social conditions 20th century
Student movements history 20th century
General Strike France 1968
use AND with your keywords of your topic.
Terms to find Primary Sources:
sources, memoirs, memorials, correspondence, letters, diaries, personal narratives, autobiographies, etc.
Look for works by individuals of the time.