https://apastyle.apa.org/instructional-aids/reference-guide.pdf
APA Examples of Popular Sources. Journal (online). Author F. M. (Publication year). Article title. Journal title
?Title of Magazine Volume. #?(issue #? ?if available)
Citation-sequence (C-S) system: Each source cited in the paper is given a number [Date cited]; Volume ... Journal Article: Retrieved Online with NO DOI.
So if no DOI is used
Shahrivar 19 1389 AP The Politics Department has adopted the Chicago citation format for ... name Last name
Journal title and volume number are in italics. 2.04 No author. Article title. (Year). Journal Title volume(issue)
APA citation style refers to the rules and conventions established by the American Psychological Journal article from a subscription database (no DOI).
https://apastyle.apa.org/instructional-aids/journal-article-reference-checklist.pdf
Serial / Journal article – 8 or more authors (online – no DOI) . Your assignment states – Please reference using the APA style - 6th ed.