Carl D. Robbins in the "Auburn Avenue Theology Pros & Cons" recommends the following as crucial reading for understanding the FV movement. It outlines the debate between Herman Hoeksema and Klaas Schilder.
http://www.sibd.org/SIBD hlm files/Historical Studies/HH-KS Debate/53a_hh-ks_debate.htm
http://www.sibd.org/SIBD hlm files/Historical Studies/HH-KS Debate/53a_hh-ks_debate.htm