Final answer:
To cite an article with no author from Good Housekeeping magazine, use the article title and page number in MLA format, like ("Environmentally Friendly Flooring" 24).
Step-by-step explanation:
To create an in-text citation for the article "Environmentally Friendly Flooring" published in Good Housekeeping magazine in December 2011, and referenced on page 24, you would follow the MLA format guidelines. Since no author is provided, the citation within the text would include a shortened version of the article title in quotation marks, followed by the page number in parentheses. For example: ("Environmentally Friendly Flooring" 24). If you had the name of the author, it would precede the title. Remember to place the period after the closing parenthesis of the citation.