The Bodleian Law Library holds a small collection of commentary on Swedish law, some of which is in English. Shelfmarks start Sweden. The current collection is on the Third Floor.
Please note that for legislation (post 1988) and cases you will need to use an online source.
Other printed resources which may be useful are comparative studies involving one or more of the Scandinavian legal systems, will have shelf marks starting General. The monographs shelved on Floor 2; comparative law journals 2000 onwards are on Floor 1 (issues 1999 and earlier are on Floor 0).
A useful starting work if you are new to this jurisdiction is the work below.