To in-text cite multiple authors in APA style (7th edition), follow these guidelines:

• One author: Include the author's last name and year every time.
  Example: (Luna, 2020) or Luna (2020)

• Two authors: Include both authors' last names in every citation. Use an ampersand (&) between names in parenthetical citations and the word "and" in narrative citations.
  Example parenthetical: (Salas & D’Agostino, 2020)
  Example narrative: Salas and D’Agostino (2020)

• Three or more authors: Include only the first author's last name followed by "et al." in every citation, even the first one.
  Example parenthetical: (Martin et al., 2020)
  Example narrative: Martin et al. (2020)

Additional points:

• Use the author-date citation system, including the year with every citation in parenthetical form.
• In narrative citations, after the first citation in a paragraph, the year may be omitted unless ambiguity arises or a new paragraph begins.
• For group authors, spell out the full name the first time with abbreviation in brackets, then use the abbreviation thereafter.
• If multiple works by the same authors and year exist, add letters (e.g., 2020a, 2020b) to differentiate

This method ensures clarity and consistency in citing sources with multiple authors in APA style.