Robert J. Austin, A Manual of Fingerweaving (Crazy Crow Trading Post, 
  P.O. Box 847, Pottsboro, TX 75076-0847, 2000).  www.crazycrow.com.

Dorothy K. Burnham, The Comfortable Arts, Traditional Spinning and Weaving
  in Canada (National Museums of Canada, Ottawa, 1981), pp. 36-51.

Jesse Clemans, "The Sash of the Voyageur", Piecework 4:3, May-June 1996,
  pp. 54-60.

Peter Collingwood, "Ply-Split Braiding I", Weaver's 29:47-51; "Ply-Split 
   Braiding II: Two-Layered Oblique Interlacing", Weaver's 32: 46-49; 
   "Single Course Oblique Twining", Weaver's Winter 1998.

Peter Collingwood, The Technique of Ply-Split Braiding (Bellew, 1998). 

Virginia I. Harvey, Split-Ply Twining, Threads in Action Monograph I
  (HTH Publishers, Santa Ana, CA, 1976).

Betsy D. Quick & Judith A. Stein, Ply-split Camel Girths of West India,
  Pamphlet Series Vol. 1, Number 7, Museum of Cultural History, 
  University of California, Los Angeles, 1982.

Noemi Speiser, The Manual of Braiding, 3rd Edition, Basel, 1983 (self 
  published),  pp. 42-44.  Ordering address:  Noemi Speiser,
  Ziefener-strasse 25, CH-4424 Arboldwil, Switzerland.
  
Alta Turner, Finger Weaving: Indian Braiding (Little Craft Books Series
  of Sterling Publishing Co., Inc., New York, 1973).
  
Adrienne Whitelaw, "Assomption Sash, a Long Tradition in French Canada",
  Handweaver & Craftsman 21:3, Summer 1970, pp. 12-14, 36.