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MLA

Porter, R.S, and R.S Snyder. "Soluble Nonprotein Nitrogen of Soil." , 61-64.. Print

APA

Porter, R., & Snyder, R. (0000). Soluble Nonprotein Nitrogen of Soil.

Chicago

Porter, R.S., and R.S Snyder. "Soluble Nonprotein Nitrogen of Soil" (1916): 61-64..