Field Guide to the Ladybirds of Britain and IrelandHelen E. Roy, Richard Lewington, Peter M. J. Brown · First published 2018Open the Tome
Field Guide to the Ladybirds of Great Britain and IrelandHelen E. Roy, Peter M. J. Brown · First published 2018Open the Tome
Natural History of Ladybird BeetlesMichael Majerus, Helen E. Roy, Peter M. J. Brown · First published 2016Open the Tome
LadybirdsHelen E. Roy, Peter M. J. Brown, Richard F. Comont, Remy L. Poland, John J. Sloggett · First published 2013Open the Tome
Guide to Ladybirds of the British IslesM.E.N. Majerus, Helen E. Roy, Peter M. J. Brown, Remy Ware · First published 2006Open the Tome
Concepts, techniques, and models of computer programmingPeter Van Roy, Seif Haridi · First published 2004Open the Tome
