Irrespective of clime and age, man cannot but be thrilled and inspired by the soul-stirring words of Swami Vivekananda. With humanity at the crossroads today, there cannot be a healthier exercise than to reflect on the profound message of this great prophet of humanity. The book contains 32 articles on various facets of Swamiji's life and teachings.
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.