How to cite and publish unpublished governmental statistics correctly? Conducting a research which needs governmental statistics, I have encountered a problem. The problem is I need to have precise data on farming in an area, but the data are not published. 

I had to go to the relevant governmental office and convince them to provide me with the data. Afterwards, I had interviews with officials and they--based on their internal documents--provided me with the necessary detailed data. 

Now I am thinking how to cite the information; I think the obtained data should be published, at least as a letter to the researcher, so that I can refer to it.

What I am going to do is that I give the obtained information to the department and ask them to check it for reliability, then they issue an official document containing the necessary approved information. However, the point is I am myself preparing the tables etc., so this is my work--the tables produced by hours and hours of interview and then extracting the info and then making tables based on it--not theirs although they will check it carefully.

What to you think? How should I deal with it?
I would cite it as "Agency name, unpublished data" in the text. As a made-up example in a list of citations:

US Department of Agriculture, Farm Information Statistics 1999-2015, Oklahoma City, Oklahoma, USA, unpublished.