The cold war and presidential doctrines

The Kennedy Doctrine of Flexible Response 

write at least a six-eight-page paper on the doctrine that president used according to Roskin. Your research must include at least seven credible sources, apart from your textbook. Your paper must address the following: 

Fully define a doctrine and identify why the president of your choice announced a doctrine while he was in      office.    
Describe the diplomatic doctrine the president      followed, with reference to specific actions or events that occurred. 
Describe the effect that the      presidential doctrine has had on regional or global affairs since it was      announced during the Cold War. 
Cite at least seven reputable      sources, excluding Wikipedia, encyclopedias, dictionaries, blogs and other      material that does not qualify as reputable academic sourcework.