Caplan, Bryan. <br/><br/>
Selfish Reasons to Have More Kids Why Being a Great Parent Is Less Work and More Fun Than You Think / 
Bryan Caplan. 
 - New York :  Basic Books,  2011. 
 - X, 228 s. ;  24 cm. 
<br/><br/>bibliogr. 
<br/><br/><label>ISBN: </label>0465018673 
<br/><br/><label>Uniwersalna Klasyfikacja Dziesiętna: </label> 316.811/.815