United States. Department of Commerce. (1915). Determination of nitrogen in coal: Comparison of various modifications of Kjeldahl method with Dumas method. GPO.
Chicago Style (17th ed.) CitationUnited States. Department of Commerce. Determination of Nitrogen in Coal: Comparison of Various Modifications of Kjeldahl Method with Dumas Method. [Washington]: GPO, 1915.
MLA (9th ed.) CitationUnited States. Department of Commerce. Determination of Nitrogen in Coal: Comparison of Various Modifications of Kjeldahl Method with Dumas Method. GPO, 1915.
Warning: These citations may not always be 100% accurate.