Dr. Russell is correct about McGhee's newer work as being your guide for the Confederate units. The best source for the 1861 Missouri State Guard unit you seek is the 1995 book "Sterling Price's Lieutenants" by the same James E. McGhee with co-authors Richard C. Peterson, Kip A. Lindberg, and Keith I. Daleen. It is published by Two Trails Publishing, and I believe is still in print. If not, you may use Interlibrary Loan--the researcher's best friend. These are the two I use first for information about Missouri southern regular units.