Book recommendations on empirical methods in economic research and econometrics? This question is more so geared toward anyone with research experience within economics, though of course, anyone is welcome to respond. 

I'm an undergraduate math major with a minor in economics. I'd like to know which textbooks are decent for introducing one to research methods in economics? Graduate level is fine, perhaps even preferred. If a student was to take his research to "the next level" (publishing worthy), which textbooks would provide the rigor and insight to develop said research?

Also, any introductory recommendations for econometrics? 

Thank you in advance. 

ANNENDUM: 
From the limit experience I have in economics, I've found the following areas to fascinate me on multiple occasions (in no particular order):


Game theory
Macroeconomics (monetary policy) 
Microeconomics (i.e., commodity pricing) 
Pricing theory
Firstly, for basic introductory econometrics, the following is quite good:


  "Introduction to Econometrics" by Stock and Watson.


It is light on technical details, and heavy on intuition. This might not appeal to you if you are a math major, but it's the most important thing to get straight if you are interested in applying the empirical methods rather than developing new econometric methods.

Stock and Watson is very basic, so you will probably want to supplement it. Good choices are likely to be


  "Mostly Harmless Econometrics" by Angrist and Pischke


(this is another book that puts intuition first, but now with more formal detail), and for an advanced graduate treatment


  "Econometric Analysis of Cross Section and Panel Data" by Wooldridge.


I don't know Wooldridge very well, but I know that his book is popular and well-loved among econometrics grad students.

These books have a bias in favour of microeconometrics and deal less, if at all, with time series methods. More comprehensive coverage can be found in


  "Econometrics" by Hayashi


or


  "Econometric Analysis" by Greene.


The book by Hayashi is probably better for self-study; Greene is more of a comprehensive reference book.