Herer are a few resources to help you with the Extended Essay.
Extended Essay Guide (complete) - Everything you need to know about the EE format
Extended Essay History Guidelines
Extended essay - Reflections on planning and progress form
Palmer High School Library Media Center Resources - please - do yourself (and your supervisor) a favor and create your bibliography using Noodle Tools!!
Purdue Online Writing Lab Invention for Research Writing
Purdue Online Writing Lab: Chicago/Turabian Style Citations