Ron Larson, Bruce H. Edwards ; with the assistance of David C. Falvo. Irwin Unger ; with the assistance of Debi Unger. Ron Larson, Robert P.Hostetler, Bruce H. Edwards. ; with the assistance of David E.Heyd. Alvin S. Goodman ; with the assistance of David C. Major ... Ron Larson, Robert P. Hostler ; with the assistance of David E. Heyd. by Irwin Unger. With the assistance of Debi Unger. edited by Andrew Harding, with the assistance of Khin Khin Oo. by John M. Cage, with the assistance of C. J. Bashe. prepared with the assistance of Alan Evison. Ron Larson, Robert P. Hostetler, Bruce H. Edwards ; with the assistance of David E. Heyd.