Stevenson , F . J <br/><br/>
Humus chemistry:  genesis , composition , reactions 

 - New York  John wiley & sons  1982 
 - xiii , 443p. 
<br/><br/><label>ISBN: </label>0471092991 
<br/><br/><label>Subjects--Index Terms: </label>Human chemistry 
<br/><br/><label>Dewey Class. No.: </label>631.417  / STE