Farrell, Charles E. <br/><br/>
Chiggers of the Genus Euschongastia (acarina: trombiculidae in North America) 

 - Washington :   Smithsonian Institution,   1956. 
 - 235 p. :   il. ;   21 cm. 
 - United States National Museum ;   V. 106; Nš 3364 .