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	1		Sawyer, Clair N. Chemistry for environmental engineering / Clair N. Sawyer, Perry L. McCarty, Gene F. Parkin . — 4th ed. — New York : McGraw-Hill, [1994]. — 658 p. : il. ; 25 cm. — ( Water resources and environmental engineering)
	2		Sawyer, Clair N. Chemistry for environmental engineering / Clair N. Sawyer, Perry L. McCarty . — 3rd ed. — Tokyo : McGraw-Hill book company, [1978]. — 532 p. : il., gráf., tab. ; 21 cm. — ( Water resources and environmental engineering)