Secondary Sources:
books, book chapters, journals, journal articles, reports, web pages, blog, interviews, emails, letters ...
Primary Sources:
cases, decisions, legislation, statutes, regulations, bills, EU legal documents, opinions of governing bodies, treaties ...
See also short forms of case names in Oscola 4 ed. p. 14 and short forms for legislation p. 23 and 29
For more information on pinpoint for primary sources see Oscola 4. ed. page 19, chapter 2.1.6 and page 24, chapter 2.4.2 and page 27. chapter 2.5.3.
For more information on pinpoint for secondary sources see Oscola 4. ed. page 33, chapter 3.1.3
When citing more than once the same source provide a cross citation. It is also acceptable to give the full citation every time a source is cited. You should always give the full citation if the previous citation is in an earlier chapter.
For more information see pages 5-7 in Oscola 4 ed.