BBC: Edward IV (1442 - 1483): Edward was the eldest surviving son of Richard Plantaganet, Duke of York, who was declared successor to Henry VI in 1460.
Infoplease Encyclopaedia: Edward IV: Brief biography and links to further reading.
The Arrival of Edward IV and the Recovery of His Kingdom: An anonymous contemporary account of the events surrounding the battles on Barnet and Tewkesbury, including a commentary from the 1838 Camden Society edition.