The Modern Language Association (MLA) style is most commonly used when writing papers and citing the sources within the liberal arts and humanities. According to this style, the elements should be listed in the following order: author, title of source, title of container, other contributors, version, number, publisher, publication date and location.
In this case, the citation according to the MLA style would be: Atwood, Margaret. Ed. Earl G. Ingersoll. “Waltzing Again: New and Selected Conversations with Margaret Atwood”. Princeton: Ontario Review, 2006. Print