Adamczak-Krysztofowicz, Sylwia. “How Useful Is Tandem Language Learning? Forms, Potentials and Limits of Tandem Work in E-Tandem Learning in University Language Courses”. Glottodidactica, vol. 45, no. 2, Dec. 2018, pp. 39-54, doi:10.14746/gl.2018.45.2.01.