What if the articles author is not listed as anonymous what is used for the authors name in the in-text citation?

From The OWL at Purdue (see related link):

In Text: Unknown Author: If the work does not have an author, cite the source by its title in the signal phrase or use the first Word or two in the parentheses. Titles of books and reports are italicized or underlined; titles of articles and chapters are in quotation marks.

A similar study was done of students learning to format research papers ("Using APA," 2001).

Reference Page:

Unknown AuthorMerriam-Webster's collegiate dictionary (10th ed.).(1993). Springfield, MA: Merriam-Webster.

NOTE: When your essay includes parenthetical citations of sources with no author named, use a shortened version of the source's title instead of an author's name. Use quotation marks and italics as appropriate. For example, parenthetical citations of the two sources above would appear as follows: (Merriam-Webster's, 1993) and ("New Drug," 1993).