Russell, James, Erika Lundy, Steve Barnhart, Charlie Brummer, Steve Ensley, Patrick Gunn, Adam Janke, Dan Loy, Dale Miller, Peggy Miller-Auwerda, Kenneth Moore, Dan Morrical, Jill Paxton, Joe Sellers, Shawn Shouse, Mary Wiedenhoeft, Claire Andresen, Colby Redifer, and Justin Bisinger. 2018. Pasture Management Guide for Livestock Producers, 2nd ed. AS 0014, Iowa State University Extension and Outreach, Iowa Beef Center, Ames, IA.

Barnhart, S. K., D. G. Morrical, J. R. Russell, K. J. Moore, P. A. Miller, and C. E. Brummer. 1998. Pasture Management Guide for Livestock Producers. Pm-1713, Iowa State University Extension, Ames, IA.

Drallmeier, G. S., R. H. Teyker, and K. J. Moore. 1988. Crop Science Laboratory Manual. Vocational Agricultural Services, University of Illinois, Urbana, IL.