Pacheco, V¡ctor et.al. <br/><br/>
Occasional papers in Conservation Biology ;   No. 2 

 - Washington : XXU :   Conservation International,   1995. 
 - p. 2-35 
 - Irregular 
 - No. 2(Feb. 1998) 
 - Occasional papers in Conservation Biology ;   No. 2 .
 - Conservation International. .