On a few of our census records, the source citation information was inadvertently turned on the “record page.” We are in the process of getting those back on the record page.
In the meantime, you can find the information on the image page, on the source panel. To see the source panel, first go to the image, and open the panel by click on the grey arrow on the right hand side.
Once the panel is open, you will see the information you see for the source citation.
We are currently updating all the UK and the US 1800 and 1790 census. If you see something else, please feel free to leave me a comment.