Blum, Daniel J..  <br/><br/>
The E-Mail Frontier :   Emerging Markets and Evolving Technologies. /  
Blum Daniel J., Litwack David M.. 
 - Reading, Massachusetts :   Addison-Wesley,   1994. 
 - XX, 476 s.:   il.;   24 cm. 
<br/><br/><label>ISBN: </label>0201568608