S. Khoza, S. Ford, E. . Buthelezi, i D. . Tanyanyiwa, „Comparative study of Chemical Pathology sample collection tubes at the largest hospital in South Africa: Comparison between BarricorTM and serum separator tubes “, J Med Biochem, vol 40, izd. 4, str. 358–366, Apr. 2021, doi: 10.5937/jomb0-27216.