1. Alloway, B. J. (2013). Sources of heavy metals and metalloids in soils. In: Heavy metals in soils, Eds: Springer, p. 11–50. https://link.springer.com/content/pdf/10.1007%2F978–94–007–4470–7.pdf
2. Al-Jobori, K. M., & Kadhim, A. K. (2019). Evaluation of sunflower (Helianthus annuus L.) for phytoremediation of lead contaminated soil. Journal of Pharmaceutical Sciences and Research, 11(3), 847–854.
3. Anonymous. (2018). Resmî Gazete Tarihi: 23.02.2018 Resmî Gazete Sayısı: 30341. Tarımda kullanılan organik, mineral ve mikrobiyal kaynaklı gübrelere dair yönetmelik. Regulation on organic, mineral and microbial fertilizers used in agriculture. https://www.resmigazete.gov.tr/eskiler/2018/02/20180223-4.htm
4. Anonymous. (2019a). https://www.humintech.com/(Accessed 12.03.2019a).
5. Anonymous. (2019b). https://www.helpmefind.com/rose/l.php?l=2.41061