Morton, D. J., Whitby, P. W., Jin, H., Ren, Z., & Stull, T. L. (1999). Effect of Multiple Mutations in the Hemoglobin- and Hemoglobin-Haptoglobin-Binding Proteins, HgpA, HgpB, and HgpC, of Haemophilus influenzae Type b. American Society for Microbiology.

Morton, Daniel J., Paul W. Whitby, Hongfan Jin, Zhen Ren, e Terrence L. Stull. Effect of Multiple Mutations in the Hemoglobin- and Hemoglobin-Haptoglobin-Binding Proteins, HgpA, HgpB, and HgpC, of Haemophilus Influenzae Type B. American Society for Microbiology, 1999.

Morton, Daniel J., et al. Effect of Multiple Mutations in the Hemoglobin- and Hemoglobin-Haptoglobin-Binding Proteins, HgpA, HgpB, and HgpC, of Haemophilus Influenzae Type B. American Society for Microbiology, 1999.