3G E-Learning LLC, USA. (2023). Child health, safety and nutrition. 3G E-Learning LLC.
芝加哥风格引文3G E-Learning LLC, USA. Child Health, Safety and Nutrition. New York, NY: 3G E-Learning LLC, 2023.
MLA引文3G E-Learning LLC, USA. Child Health, Safety and Nutrition. 3G E-Learning LLC, 2023.
警告：这些引文格式不一定是100％准确.