Irving Lavin and John Plummer, ed., Studies in Late Medieval and Renaissance Paintings in Honor of Millard Meiss. New York, New York University Press, 1977. Volume 1: text, 163 + xx pp.; Volume 2: plates, 164 pp., $75 Wendy Stedman Sheard and John T. Paoletti, ed., Collaboration in Italian Renaissance Art. New Haven and London, Yale University Press, 1978. 268 + xxi pp., illus. $20