Carve out effective intervention and extension time at all three tiers of the RTI pyramid. Explore more than a dozen examples of creative and flexible scheduling, and gain access to tools you can use immediately to overcome implementation challenges. These books are full of examples from real schools that have achieved these results without using additional resources or extending the school day.
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.