An anthology is a collection of works on a common theme, often with different authors for the selections and usually with an editor for the entire volume.
Begin with the editor(s) of the anthology.
Follow the names with the label "editor" for one editor or "editors" for two editors (for more than two editors, give the first name followed by "et al." and the label "editors").
Continue with the title of the anthology and publication information as for a book.