Suggestions for finding grandfather's Naturalization records?

Question

I am trying to acquire a copy of my grandfather's naturalization records for dual citizenship. He was naturalized in approx. 1960- 1963 in New York State, Westchester County. Any suggestions of where to look? PLEASE

Answer 1

ancestry.com

Answer 2

NARA  (National Archives)

Answer 3

Try:

http://naturalizationrecords.com/usa  (The link ties into Ancestry.com)