The Magna Carta originated with a royal charter granted by King John of England in 1215. It has subsequently been reissued, revised and/or confirmed many times, most significantly by Henry III in 1225. In 1297, it was confirmed in Parliament by Edward I and placed on the Statute Roll.
The principles of English law are derived from clause 39* of the original charter which provides that all power comes from the law and that no man is above it (commonly referred to as the Rule of Law). After Henry III's revision in 1225, as confirmed in 1297, this clause became "chapter" 29. "Cap. 29" is considered the proper reference and should be used in all citations.
[*Note: Numbering is by convention. In the charter itself, the clauses are not numbered and the text reads continuously.]
It is published in both Latin and English in Magna Carta, 2d ed., by J.C. Holt (available in the Vancouver Courthouse Library).
The Magna Carta, 1215, is printed in the Revised Statutes of British Columbia, 1911, vol. 4 [1982 reprint] (available in most BC courthouse libraries).
This volume contains the original 1215 version translated from Latin and also provides brief explanatory notes on reissues.
The reissue of 1225, The Magna Carta, 9 Hen. 3 , is published in the Statutes at Large, vol. 1 (available in the Vancouver and Victoria courthouse libraries).