What is a paragraph and what should be in it; paragraph links
https://www.rlf.org.uk/resources/paragraphs-and-links/
(Royal Literary Fund)
How to structure an academic paragraph
https://www.ncl.ac.uk/academic-skills-kit/writing/academic-writing/paragraphing/
(Newcastle University)
Linking words
https://libguides.staffs.ac.uk/academic_writing/linking
(Staffordshire University)
Guide to writing a paragraph (download)
https://library.leeds.ac.uk/downloads/download/58/writing_a_paragraph
(University of Leeds)