Share 'Colloid vs. Crystalloid IV therapy'

Hey, I'm trying to write a 3 page essay in one of my EMS classes comparing Colloids vs. Crystalloids. I can't find  hardly any material and no I'm stuck. I've come up with these three categories to compare-  1) mortality rate as compared to pts on the other type of therapy 2) field practicality- which is easier to use in different fields 3) cost effectiveness Any tips? ideas? resources?