Isaac, Stephen,  1925- <br/><br/>
Handbook in research and evaluation :  a collection of principles, methods, and strategies useful in the planning, design, and evaluation of studies in education and the behavioral sciences / 
Stephen Isaac ; colab. William B. Michael. 
 - San Diego California, E.U.A. :  Robert R. Knapp,  c1971. 
 - 186 p. :  gráfs., tablas 
<br/><br/><label>Encabezamiento--Tema: </label><br/>Investigacion psicológica<br/>Educación--Investigación