United States. Environmental Protection Agency & United States. Environmental Protection Agency. Library Systems Branch. (1976). EPA cumulative bibliography, 1970-1976. published by National Technical Information Service for Library Systems Branch, Management and Organization Division, Office of Administration, Office of Planning and Management, United States Environmental Protection Agency.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)United States. Environmental Protection Agency و United States. Environmental Protection Agency. Library Systems Branch. EPA Cumulative Bibliography, 1970-1976. Springfield, VA: published by National Technical Information Service for Library Systems Branch, Management and Organization Division, Office of Administration, Office of Planning and Management, United States Environmental Protection Agency, 1976.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)United States. Environmental Protection Agency و United States. Environmental Protection Agency. Library Systems Branch. EPA Cumulative Bibliography, 1970-1976. published by National Technical Information Service for Library Systems Branch, Management and Organization Division, Office of Administration, Office of Planning and Management, United States Environmental Protection Agency, 1976.