About Robert Switzer Books by Robert Switzer Interface Online v.1.0 (3-Year School License for Unlimited Users) by (author) Sylvie Webb, Selena di Paolo, Brenda Golden, Debbie J. Chambers & Robert Switzer Interface Online v.2.0 (3-Year School License for Unlimited Users) by (author) Sylvie Webb, Selena di Paolo, Brenda Golden, Debbie J. Chambers & Robert Switzer