Both American Psychological Association style and Modern Language Association style recommend using the first one or two words of the source's title, if the source does not have an author. Thus, the citation would consist of a short title, placed inside parentheses.
Within the parenthetical citation, the punctuation of the abbreviated title will depend on which type of source it is. Titles of longer works like books and reports will be italicized. Titles of shorter works like articles and web pages are placed in quotations.
Including an abbreviated title in the parenthetical citation ensures that a source is properly documented, even without an author's name. Any other notation included in the parenthetical citation will depend on your preferred style of formatting. APA recommends including the date of publication, while MLA recommends including a page number.