Osterbrock, Donald E. <br/><br/>
Astrophysics of gaseous nebulae and active galactic nuclei / 
Donald E. Osterbrock, Gary J. Ferland. 
 - 2nd ed. 
 - [S.l.] :  University Science Books,  2006. 
 - 496 p. ;  24 cm. 
<br/><br/><label>ISBN: </label>1891389343 9781891389344 
<br/><br/><label>Dewey Class. No.: </label>523.1125