| تکرار نام مولف : | ؛Theodore E. Christensen, Brigham Young University, David M. Cottrell, Brigham Young University, Richard E. Baker, Northern Illinois University ; with contributions from: Valdean C. Lembke, Professor Emeritus, University of Iowa, Thomas E. King, Professor Emeritus, Southern Illinois University, Edwardsville, Cynthia G. Jeffrey, Iowa State University. |
