Le botteghe della fantasia, di F. passatore e S. De Stefanis. Atti del dibattito sulla drammatizzazione alla Rotonda della Besana - Milano - febbraio 1972. Un'esperienza di teatro nella scuola, di A. izzo . 16mo pp. 114 Brossura (wrappers) Copertina di Salvatore Gregoretti Molto buono (Very Good)
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.