An online newsletter can be cited in academic writing in the same way as any other online source. The following example includes the full citation, including the author’s name and publication date, for an article published on an online newsletter:
(Johnson, A. (2018).
Tips for maximizing your newsletter’s reach.) Retrieved from https://www.mynewsletterjournal.com/tips-for-maximizing-your-newsletter-s-reach/.
Alicia Johnson. “Tips for Maximizing Your Newsletter’s Reach.” MyNewsletterJournal. N.p.
, 18 Dec. 2018. Web. 19 Apr. 2019.