J. R.  Harlan, Celarier, R. P., Richardson, W. L., Brooks, M. Hoover, and Mehra, K. L., ?Studies on Old World Bluestems II?, Oklahoma A&M College Experiment Station Technical Bulletin, vol. T72, pp. 3-23, 1958.

J. R.  Harlan, Celarier, R. P., Richardson, W. L., Brooks, M. Hoover, and Mehra, K. L., ?Studies on Old World Bluestems II?, Oklahoma A&M College Experiment Station Technical Bulletin, vol. T-72, pp. 1-23, 1958.

J. R.  Harlan and de Wet, J. M. J., ?The compilospecies concept?, Evolution, vol. 17, pp. 497-501, 1963.