Final answer:
The cited source is a magazine article from the periodical 'US News and World Report' based on the information given in the citation.
Step-by-step explanation:
The citation provided refers to an article titled "Eat This Now!" by Jay S. Peterman, which was published in the US News and World Report magazine on March 28, 2005, as indicated by the page numbers 56-58. This kind of publication is a periodical source, specifically a magazine article. The magazine is a type of periodical that often provides a mix of news, opinion, and feature articles. Periodicals like this do not require a publisher to be listed in the citation since they are regularly published works and the name of the periodical itself suffices to locate the source. The author name followed by the article title in quotation marks, the magazine title in italics, the date of publication, and the page numbers align with the guidelines for citing articles from periodicals.