A parenthetical citation may never contain only the page number of a source true false

The answer is TRUE.

In MLA style, in-text citations, called parenthetical citations, are used to document any external sources used within a document (unless the material cited is considered general knowledge) ... In most cases, the parenthetical citations include the author's last name and the specific page number for the information cited.

Include a parenthetical citation when you refer to, summarize, paraphrase, or quote from another source. For every in-text citation in your paper, there must be a corresponding entry in your Works Cited list. MLA parenthetical citation style uses the author's last name and a page number; for example: (Field 122) The answer is True.