Papers of Margaret Walker, 1938-1991 [manuscript]. Collection number: MS 8495
Series 15: Margaret Walker: early material, 1941-1986 Subseries 90-2-1: Margaret Walker Folk Dance Centre: early material, 1941-1986 Piece 3: Borovansky Ballet company. Note to company members from Borovansky, n.d.
Signed by Edouard Borovansky.