Urban research methods 
edited by Jack P. Gibbs 
 - Princeton, N.J.  Van Nostrand  1966 
 - xxii, 625 p. : ill. ; 24 cm. 
<br/><br/>p. 581-621. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Cities and towns--Research<br/>Cities and towns--United States