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, and 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.