Naseema, B. S., Ambily, P., Thomas, G., Biju, M. T., Pratheesh, K. N., George, X., Pradeep, K. G. T., Rajith, R., Prathibha, R. K. & Visal, K. S. 2014. Pesticide residues in soils under cardamom cultivation in Kerala, India. Pesticide Research Journal 26(1): 35–41.