Spencer, D. (1939). Fulcra of conflict: A new approach to personality measurement. World book.
Čikaški stil citiranja (17. izdanje)Spencer, Douglas. Fulcra of Conflict: A New Approach to Personality Measurement. Yonkers-on-Hudson N. Y.: World book, 1939.
MLA način citiranja (8. izdanje)Spencer, Douglas. Fulcra of Conflict: A New Approach to Personality Measurement. World book, 1939.
Upozorenje: Ovi citati možda nisu uvijek 100% točni.