Perkins, J. F. <br/><br/>
Hymenoptera :  Ichneumonoidea II / 
by J.F. Perkins. 
 -  Royal Entomological Society,  1960 
 - Handbooks for the identification of British insects ;  v.7, part 2(aii) .
 - Handbooks for the identification of British insects ;  v.7, part 2(aii) .