This is the official book of large vehicle theory test questions, which explains all the answers. It will help to prepare the reader for the multiple choice part of the theory test.
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.
What I learned from this book? Everything! Also in the period since studying this mighty tome, I learn that the roads are largely filled with pig ignorant idiots and crackpots, mainly in company cars.