How to cite USGS website refereing Landsat accuracy?
Personally, I would try to cite the project documentation, which has its own official page, rather than the webpage documentation.

Alternatively, if you cannot find those details in a tech report, I would cite the webpage as a user manual with a URL. 

Last, for your specific style questions are unanswerable without knowing your target venue (e.g, journal, report, thesis, etc.).