1. Asman, W. A. H., Jonker, P. J., Slanina, J., & Baard, J. H. (1982). Neutralization of acid in precipitation and some results of sequential rain sampling. In: H. W. Georgii, J. Pankarth (Eds.) Deposition of Atmospheric pollutants.(pp. 115–124). Dordrecht, The Netherlands: Reidel.
2. Aneja, V. A., Schlesinger, W. H., Niyogi, D., Jennings, G., Gilliam, W., Knighton, R. E., et al. (2006). Emerging national research needs for agricultural air quality. EOS, 87(3), 25–36.
3. Aneja, V. P., Murray, G. C., & Southerland, J. (1998). Atmospheric nitrogen compounds: Emissions, transport, transformation, deposition and assessment. Environmental Manager, 22–25.
4. Boussingault, J. B. (1851). Die Landwirtschaft in ihren Beziehungen zur Chemie Physik und Meteorologie. Auflage II, Übersetzt von Graeger H. Halle, Verlag von Ch. Graeger.
5. Bran+Luebbe, AutoAnalyzer Applications. Method No. US-696D-82X. 1025 Busch Parkway, Buffalo Grove, IL 60089. pp 1–6.