Sergei, G. 2020. Bernhard Brehmer & Jeanine Treffers-Daller (Eds): Lost in Transmission : The Role of Attrition and Input in Heritage Language Development. Journal Of Language Education and Development (JLed). 2, 2 (Nov 2020), 322–328. DOI:https://doi.org/10.52060/jled.v2i2.418.