Penulis: Nancy E. Whiting

Frank R. Spellman is assistant professor of Environmental Health at Old Dominion University. He is the author or co-author of more than 50 books, including Physics for Nonphysicists (GI, 2009) and Occupational Safety and Health Simplified for the Chemical Industry (GI, 2009). Nancy E. Whiting is a freelance technical writer in water/wastewater issues, environmental science, and education. She is the co-author with Frank Spellman of Safety Engineering, 2nd Ed. (GI, 2005) and Environmental Science and Technology, 2nd Ed. (GI, 2006).