Rumyantseva, Nataliya, et al. «M. M. SPERANSKY’S CONTRIBUTION IN DEVELOPMENT OF LANGUAGE OF BUSINESS DOCUMENTATION IN THE LATE 18TH AND FIRST THIRD OF THE 19TH CENTURIES». Revista Inclusiones, marzo de 2019, pp. 83-91, https://revistainclusiones.org/index.php/inclu/article/view/2016.