14 1 50 Margaret L Vickery Additional Author mixed material John Wiley & Sons 1984 Margaret R.Taber Additional Author mixed material Houghton Mifflin 1980 Margaret L. Lial Additional Author Charles D. Miller Additional Author mixed material Scott Foreman 1982 Ashok K. Dult Additional Author M. Margaret Geib Additional Author mixed material Westview Press 1987 Margaret S.W.U Additional Author mixed material Harcourt Brace Javano Vich,Inc 1979 Zane K. Quible Additional Author Margaret H. Johnson Additional Author mixed material Winthrop Publisher Inc. 1980 Margaret R Additional Author Marshall Additional Author mixed material Westview Press Margaret Stautberg Additional Author Greenwood Additional Author mixed material Woodsworth 1983 Bertha Margaret Frick Additional Author mixed material H.W Wilson Company Gunawan T. Additional Author Margaret S. Additional Author mixed material Delta Teknik Group 1994 Gunawan T. Additional Author Margaret S. Additional Author mixed material Delta Teknik 1989 Gunawan T. Additional Author Margaret Additional Author mixed material Delta Teknik 1990 Gunawan T. Additional Author Margaret S. Additional Author mixed material Delta Teknik Group 1989 Margaret Muth Alibasah Additional Author mixed material Djambatan 1978