ParagraphIndent
is an option for Cell which specifies how far in printer's points to indent the first line of each paragraph of text.
Details

- A new paragraph is taken to start at the beginning of a cell, and after every explicit newline character in your text.
- Negative settings for ParagraphIndent make the first line of each paragraph stick out to the left.
Examples
Wolfram Research (1996), ParagraphIndent, Wolfram Language function, https://reference.wolfram.com/language/ref/ParagraphIndent.html.
Text
Wolfram Research (1996), ParagraphIndent, Wolfram Language function, https://reference.wolfram.com/language/ref/ParagraphIndent.html.
CMS
Wolfram Language. 1996. "ParagraphIndent." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/ParagraphIndent.html.
APA
Wolfram Language. (1996). ParagraphIndent. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/ParagraphIndent.html