Scenario: You read an article by Robbins that on page 270 cites another article by Wills. You want to cite Will's article, but you have not read Wills's article itself.
Robbins, Michael. "Paul Muldoon's Covert Operations." Modern Philology, vol. 109, no. 2, 2011, pp. 266-99. JSTOR, https://doi.org/10.1086/663233.
Your Works Cited list will contain the article you read, by Robbins. Your Works Cited list will NOT contain a citation for Wills's article.
Note: Whenever you can, take materials from the original and not a secondhand source.