"A Book of Gratitude," the second reader in fifth grade, is a wonderful collection of prose and poetry for boys and girls about giants and saints and far-a-way lands. The 48 selections are in a variety of styles to help the maturing mind develop an appreciation of literature. It includes works Robert Louis Stevenson, John Greenleaf Whittier, Nathaniel Hawthorne, Alfred, Lord Tennyson, Robert Frost and Anna Sewell.
Various is the correct author for any book with multiple unknown authors, and is acceptable for books with multiple known authors, especially if not all are known or the list is very long (over 50).
If an editor is known, however, Various is not necessary. List the name of the editor as the primary author (with role "editor"). Contributing authors' names follow it.
Note: WorldCat is an excellent resource for finding author information and contents of anthologies.