Sources:
- CLAYTON, Mary (2007). The Needlecrafter's Companion. 1001 Stitch Terms and Techniques, London: Collins and Brown, p. 174.
- EATON, Jan (1986). The Complete Stitch Encyclopedia. Twickenham: Hamlyn, pp. 32, 34.
Digital source of illustration(retrieved 27 January 2017).
WV