Hazelton, C. (1998). "Variations between Continuous and Spot-Sampling Techniques in Monitoring a Change in River-Water Quality". Water and Environment Journal. 12 (2): 124–9. doi:10.1111/j.1747-6593.1998.tb00161.x. S2CID108508464.
Cullum, B.M.; Vo-Dinh, T. (2014). "Chapter 1: Preparation of Liquid and Solid Samples". In Gauglitz, G.; Moore, D.S. (eds.). Handbook of Spectroscopy (2nd, Enlarged ed.). Wiley. pp. 3–14. doi:10.1002/9783527654703.ch1. ISBN9783527654703.
epa.gov
Department of Defense; Environmental Protection Agency; Nuclear Regulatory Commission (2000). "Chapter 7: Sampling and Preparation for Laboratory Measurements". Multi-Agency Radiation Survey and Site Investigation Manual (MARSSIM)(PDF). Nuclear Regulatory Commission. p. 7-1. Retrieved 5 July 2018. Sampling is the process of collecting a portion of an environmental medium as representative of the locally remaining medium.
Hazelton, C. (1998). "Variations between Continuous and Spot-Sampling Techniques in Monitoring a Change in River-Water Quality". Water and Environment Journal. 12 (2): 124–9. doi:10.1111/j.1747-6593.1998.tb00161.x. S2CID108508464.