| APA | Smart Define. (-0001). online charging system thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/online_charging_system/thesaurus/broader |
| Chicago | Smart Define. -0001. "online charging system thesaurus" https://smartdefine.org/online_charging_system/thesaurus/broader (accessed September 23, 2026). |
| Harvard | Smart Define -0001, online charging system thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/online_charging_system/thesaurus/broader>. |
| MLA | Smart Define. "online charging system thesaurus" 30 November -0001. Web. 23 September 2026. <https://smartdefine.org/online_charging_system/thesaurus/broader> |