| APA | Smart Define. (2016). picture-postcard thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/picture-postcard/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "picture-postcard thesaurus" https://smartdefine.org/picture-postcard/thesaurus/synonyms (accessed September 26, 2026). |
| Harvard | Smart Define 2016, picture-postcard thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/picture-postcard/thesaurus/synonyms>. |
| MLA | Smart Define. "picture-postcard thesaurus" 29 March 2016. Web. 26 September 2026. <https://smartdefine.org/picture-postcard/thesaurus/synonyms> |