Coba jelasin Rujukan dari Integrasi menegak dalam bahasa melayu dong

Bramwell G. Rudd, 2014, "Courtaulds and the Hosiery & Knitwear Industry," Lancaster, PA:Carnegie.

Joseph R. Conlin, 2007, "Vertical Integration," in The American Past: A Survey of American History, p. 457, Belmont, CA:Thompson Wadsworth.

Martin K. Perry, 1988, "Vertical Integration: Determinants and Effects," Chapter 4 in Handbook of Industrial Organization, North Holland.