Gaya APA

Seltzer, M, B., Mulholland, J, M. (2012). Drud Calculation : Ratio and Proportion Problems for Clinical Practice (Ed. 9). Missouri :: Elsevier,.

Gaya MLA

Seltzer, Meta, Brown., Mulholland, Joyce, M.. "Drud Calculation : Ratio and Proportion Problems for Clinical Practice". Ed. 9 Missouri :: Elsevier,, 2012. Text.