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A journal (also known as a 'periodical') is basically an academic magazine. They can be published in print and/or online as e-journals.
They are published at regular intervals (e.g. weekly, monthly or quarterly) and so they are good for keeping you up to date with legal developments.
Law journals contain articles by learned authors, such as university academics. By reading these articles, you can enhance your understanding of legal issues.
If a journal is 'peer reviewed' this means it contains articles that have been critically reviewed by experts in the field before being published.
Often the title of a law journal will be referred to using an abbreviation, e.g. LJIL for Leiden Journal of International Law.
To find out what an abbreviation means, check the Cardiff Index to Legal Abbreviations.
You may see law journal articles referred to using a citation.
The citation tells you who wrote the article, what it's about and where it has been published.