| APA | Smart Define. (1970). controlling idea comes from purpose and subject thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/controlling_idea_comes_from_purpose_and_subject/thesaurus/broader |
| Chicago | Smart Define. 1970. "controlling idea comes from purpose and subject thesaurus" https://smartdefine.org/controlling_idea_comes_from_purpose_and_subject/thesaurus/broader (accessed September 24, 2026). |
| Harvard | Smart Define 1970, controlling idea comes from purpose and subject thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/controlling_idea_comes_from_purpose_and_subject/thesaurus/broader>. |
| MLA | Smart Define. "controlling idea comes from purpose and subject thesaurus" 1 January 1970. Web. 24 September 2026. <https://smartdefine.org/controlling_idea_comes_from_purpose_and_subject/thesaurus/broader> |