Gaya APA

et.al, ., Kelter, P. (). A Discussion of Water Polluytion in the United States and Mexico; with High School aboratory Activities for Analysis of Lead, Atrazine, and Nitrate . : .

Gaya MLA

et.al, ., Kelter, Paul.B. "A Discussion of Water Polluytion in the United States and Mexico; with High School aboratory Activities for Analysis of Lead, Atrazine, and Nitrate ". : , . .