Kothny, E. L., Cook, W. A., Cuddeback, J. E., Dimitriades, B., Ferrand, E. F., McDaniel, P. W., … Weiss, F. T. (1973). Tentative method of analysis for ammonia in the atmosphere (indophenol method). Health Laboratory Science, 10(2), 115–118.

Kothny, E. L., W. A. Cook, J. E. Cuddeback, B. Dimitriades, E. F. Ferrand, P. W. McDaniel, G. D. Nifong, B. E. Saltzman, and F. T. Weiss. “Tentative method of analysis for ammonia in the atmosphere (indophenol method).” Health Laboratory Science 10, no. 2 (April 1973): 115–18.

Kothny EL, Cook WA, Cuddeback JE, Dimitriades B, Ferrand EF, McDaniel PW, et al. Tentative method of analysis for ammonia in the atmosphere (indophenol method). Health laboratory science. 1973 Apr;10(2):115–8.

Kothny, E. L., et al. “Tentative method of analysis for ammonia in the atmosphere (indophenol method).” Health Laboratory Science, vol. 10, no. 2, Apr. 1973, pp. 115–18.

Kothny EL, Cook WA, Cuddeback JE, Dimitriades B, Ferrand EF, McDaniel PW, Nifong GD, Saltzman BE, Weiss FT. Tentative method of analysis for ammonia in the atmosphere (indophenol method). Health laboratory science. 1973 Apr;10(2):115–118.