@book{4538, author = {Buchholz, Susan, and Henke, Grace.}, title = {Henke's med-math :}, publisher = {Wolters Kluwer Health/Lippincott Williams & Wilkins,}, year = {2009}, address = {Philadelphia :}, edition = {6th ed.}, url = {http://www.loc.gov/catdir/enhancements/fy0910/2008024079-d.html} }