Vaurek, Bernard F. <br/><br/>
A theory of reference service 

<br/><br/> Sobretiro de: College and Research Libraries 29 (6): 508-510, 1968 
<br/><br/><label>LCCN: </label>48060 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Servicio de consulta (Bibliotecas)