Sumtsova O. V. Olga Vitalievna. (2016). Professional english in engineering education. 2016.
Chicago-viite (17. p.)Sumtsova O. V. Olga Vitalievna. Professional English in Engineering Education. 2016, 2016.
MLA-viite (9. p.)Sumtsova O. V. Olga Vitalievna. Professional English in Engineering Education. 2016, 2016.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.