Romer, Alfred Sherwood. <br/><br/>
The vertebrate story 

 - 4 ed. 
 - Chicago :  University Press,  1959 
 - 437 p. 
<br/><br/><label>LCCN: </label>51998 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Vertebrados.
<br/><br/><label>Dewey Class. No.: </label>596  / R65