I still own the 1790 census in book form, and New Hampshire and Maine sit over my shoulder as a I type. Whenever I wrote an article I would cite to those books whenever I cited to the 1790 census. However, today, I figure that anyone doing serious genealogy research and perhaps reading this blog, has access to Ancestry.com and uses the 1790 census there. I do.
So, in the pages on the right, especially those on the Wallis family, I haven't given a citation to the 1790 census specifically. I generally say that a person appears in the census and in what town with an accounting of the household. Footnotes are designed so that a reader can go back and look at the original records quickly and efficiently. Certainly I provide enough information for someone to do that. Sometimes the 1790 census within a town is page numbered. Sometimes the page numbering is artificial and given by Ancestry.com. I think for the small towns I have thus far been using, that you can search quickly with the search engine to find the person. Perhaps if I cited to Boston or Philadelphia, I should add a page number.
In any case, that is my quandary for right now.