Levkina, R. Labor intensive of agrarian enterprises as a factor for the development of social rural in infrastructure [Text] / R. Levkina, A. Levkin, Ya. Kotko // Challenges and opportunities of scientific thought development : scientific articles collection. - Pretoria : GPG Publishing Group, 2017. - P. 66-72..
Доп. точки доступа:
Levkin, A.
Kotko, Ya.