Kreveld, David van. <br/><br/>
Structure and outcomes of study groups :  a method of determining several properties of group structure and some relationships observed with group outcomes / 
By D. van Kreveld. 
 - Van Gorcum :  Assen,  1970. 
 - 75 p. ;   24 cm. 
<br/><br/> Summary in Dutch. 
<br/><br/>Bibliography: p. 60-64. 
<br/><br/><br/>In English ad Dutch. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Sociometry.