SOWJANYA, P., et al. “Available Nutrient Status and Fertility Capability Grouping of Soils of Bobbili Mandal, Vizianagaram District, Andhra Pradesh”. Journal of the Indian Society of Coastal Agricultural Research, vol. 34, no. 1, June 2016, pp. 25-32, https://epubs.icar.org.in/index.php/JISCAR/article/view/92699.