i did edexcel but should be the same - if anything is by the same author (if not listed on govt website, then can assume its the same author for argument's sake) and the source evaluation will look the same, then there's no need to include it separately. however, if they're on substantially different subtopics (e.g. how to get a driving license vs the highway code) then they should be listed separately in the bibliography but could be in the same category in the evaluation
I have always had problems with the correct format for citation in my essay or even more in my research papers. I don't know why there are so many different formats for such a simple action as copying part of the text of another author and adding it to your essay to confirm or deny something. But I recently found special resource for students on the Internet called Cite4Me. This site has an online machine for formatting and generating citations and there are many articles about it. I started using it for my writing assignments, and it helped me avoid getting my grade dropped due to incorrect text format. I don’t know how, but it works, so if you want to check whether you have typed the citation correctly in your text or not, then you can use it.