Sources

1) Source: Duchy of Lancaster: Deeds, Series L Name: R- Fitz Harding (fil' Hard')Places: Property in Wickwar, Gloucestershire.. Reference: DL 25/218/173 (Data from direct source)
2) Source: Kingscote Family Papers "Maurice de Berchal' [Berkeley] son of Robert, son of Harding, to Adam son of Nigel, son of Arthur, Maurice's nephew.". External Link
http://discovery.nationalarchives.gov.uk/details/r/ae91310b-9ccf-45b4-a1c8-0fbd66e3accf. Reference: D471/T1/4 (Data from direct source)
3) Source: The Berkeley Estate "King Henry II and Maurice son of Robert FitzHarding.Grant by Henry, as king, of the same, to hold by service of five knights."Date: 1154. External Link
http://discovery.nationalarchives.gov.uk/details/r/1e709784-6490-48d4-9af8-ccea7bbf1abd. Reference: BCM/A/1/1/5 (Data from direct source)
4) Source: The Berkeley Estate "Robert FitzHarding and Roger de Berckele. Agreement made in Robert's house at Bristol, in the presence of Henry duke of Normandy, for Robert's son Maurice to marry Roger's daughter, with Slimbridge, being £10 worth, for her portion, and for Roger's son Roger to marry Robert's daughter, "Dated: after 1153. Reference: BCM/A/1/43/62 (Data from direct source)
5) Source: English Baronies: a Study of Their Origin and Descent, 1086-1327. Reference: Pages 13-14: Berkeley (Questionable reliability of evidence)