1. https://en.wikipedia.org/wiki/World_population.
2. http://yandex.ru/images/search?text=динамика%20площади%20пашни%20в%20мире&stype=image&lr=10747&noreask=1&source=wiz&redircnt=1437905977.1.
3. http://faostat3.fao.org/home/E.
4. www.gks.ru/wps/wcm/connect/rosstat_main/rosstat/ru/statistics/enterprise/economy/#.
5. V. N. Kudeyarov and V. M. Semenov, “Agrochemical problems and the current state of agricultural chemicalization in the Russian Federation,” Agrokhimiya, No. 10, 3 (2014).