(Secchi reading, chlorophyll filtration, freezing of water samples, etc.)
Canfield, D.E., Jr., C.D. Brown, R.W. Bachmann, and M.V. Hoyer. 2002. Volunteer lake monitoring: Testing the reliability of data collected by the Florida LAKEWATCH program. Lake and Reservoir Management 18(1):1-9.
Obrecht, D.V., M. Milanik, B.D. Perkins, D. Ready, and J.R. Jones. 1998. Evaluation of data generated from lake samples collected by volunteers. Journal of Lake and Reservoir Management 14(1):21-27. www.lmvp.org/documents/HTML/Obrecht1998.htm