Morphology, classification and life habits of the Productoidea (Brachiopoda) / 
by Helen Muir-Wood and G. Arthur Cooper. 
 - New York :  Geological Society of America,  1960. 
 - xi, 447 p. :  ill. ;  26 cm. 
 - Memoir (Geological Society of America)  81 .
<br/><br/>Bibliography : p. 339-358. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Brachiopoda, Fossil.<br/>Paleontology--Paleozoic.