APA Style (7th ed.)
Align the text in the body of your paper flush against the left margin with a ragged right margin (e.g., the alignment of this page) (American Psychological Association, 2020, p. 45). Do not use full justification, which spaces the text equally across the width of the page. See the Annotated Student Sample Paper for examples of this formatting.
Reference
American Psychological Association. (2020). Publication manual of the American Psychological Association (7th ed.). https://doi.org/10.1037/0000165-000