I am trying to find a great resource to study for functional dependency and normalization.
Anyone have any idea where should I look to? I am having difficulty different
A functional dependency isn't in any normal form. Normal Form is a property of a relation that satisfies some given set of FDs.
Don't rely on Wikipedia or Google. There is too much misinformation and rubbish from online sources. Try:
Introduction to Database Systems by Chris Date
Practical Issues in Database Management by Fabian Pascal