Ryan, George <br/><br/>
Box breathing/ 
by George Ryan 
 - California:  Bobit Business Media,  2017 
 - page 72-75 
 - Vol.41 No.1 (January 2017) 
 - Police the law enforcement magazine  page 72-75  Vol.41 No.1   0893-8989 .
<br/><br/><label>ISSN: </label>0893-8989 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Police - Physical fitness
<br/><br/><label>Dewey Class. No.: </label>BPer. 363.205  / P75