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To appropriately cite the Next Generation Science Standards, use the following format (see Citing the NGSS).
NGSS Lead States. (2013). Next Generation Science Standards: For states, by states. Washington, DC: The National Academies Press.
Online
NGSS Lead States. (2013). Next Generation Science Standards: For States, By States (insert specific section title(s) being used if not referring to entirety of the NGSS). Retrieved from https://www.nextgenscience.org/
Explanation
Next Generation Science Standards is rather a long title. When referring to it in the body of your text for the first time, spell out all the words followed by NGSS in brackets, e.g., Next Generation Science Standards (NGSS). Now that you have defined Next Generation Science Standards you can use NGSS moving forward.