Clerehugh, Valerie. Periodontology at a Glance/ Valerie Clerehugh, Aradhna Tugnait, Robert J Genco. - Somerset : Wiley, 2013. - ix, 93 p. : ill. ; 28 cm. - At a Glance (Dentistry). . includes index. ISBN: 9781405123839 LC Class. No.: RK361 / CLE 2011