Lapham, Robert. Drug calculations for nurses : a step-by-step approach / Robert Lapham, Heather Agar. - 3rd ed. - London : Hodder Arnold, 2009 - xviii, 246 p. : ill. 20 cm. Previous ed.: London: Arnold, 2003. Includes bibliographical references and index. ISBN: 9780340987339 ;0340987332 National Library of Medicine Call No.: QV 18.2 / .L37 2009