90th annual co-operative congress : : report of the proceedings. 
  MLA
  90th Annual Co-operative Congress : Report of the Proceedings. Manchester: Co-operative Union Limited, 1959.
  APA
  (1959). 90th annual co-operative congress : report of the proceedings. Manchester: Co-operative Union Limited.
  Chicago
  90th Annual Co-Operative Congress: Report of the Proceedings. Manchester: Co-operative Union Limited, 1959.