Yanchenko, Tamara. “Development of Pedology As a Scientific Branch in the USA and Western Europe in the End of the XIX – Beginning of the XX Century: Source Study Aspect”. Pedagogical Discourse0, no. 15 (October 4, 2013): 782-787. Accessed April 25, 2024. http://ojs.kgpa.km.ua/index.php/peddiscourse/article/view/962.