Seltzer, Meta Brown. Drug calculations : ratio and proportion problems for clinical practice / Meta Brown Seltzer, Joyce M. Mulholland. - 9th ed. - St. Louis : Elsevier/Mosby, 2012. - xv, 443 p. : ill. ; 28 cm. ISBN: 9780323077507 RM184.01 Subjects--Topical Terms: Pharmaceutical preparations--administration & dosage.Mathematics. Index Terms--Genre/Form: Problems and Exercises.Programmed Instruction.