Experimental design in education /
Lewis, D. Gerwyn
Experimental design in education / D. G. Lewis. - London : University of London, c1968. - 192 p.
Estadística educativa
Educación--Métodos experimentales
Experimental design in education / D. G. Lewis. - London : University of London, c1968. - 192 p.
Estadística educativa
Educación--Métodos experimentales