Business lettersKala, Mare; Kääramees, Ivi; Laane, Mare-Anne; Lukk, Alliki; Rahi, Ester; Rummel, Kärt; Rückenberg, Pille; Saar, Hele; Sepp, Monika; Tšetõrkina, Ene; Virves, Kai; Volgina, Olga1999 https://www.ester.ee/record=b1222267*est English for students of economics : business and managementTšetõrkina, Ene1991 https://www.ester.ee/record=b1197698*est English for students of economics business and management1989 https://www.ester.ee/record=b1246700*est Introductory course of english for students of engineering1989 https://www.ester.ee/record=b1217397*est Introductory course of English for students of engineeringTiits, Ene; Toomsalu, Marju; Tšetõrkina, Ene; Truu, Sirje1991 https://www.ester.ee/record=b1198304*est Standardization of English achievement test series ATUEinväli, E.; Kokkota, Valmar; Toomsalu, Marju; Truu, Sirje; Tšetõrkina, Ene; Volgina, Olga; Võrk, Evi-MaiIII Regional Seminar "Theoretical Problems of Language Testing", Tallinn, February 16-17, 1988 : summaries1988 / p. 31-34 https://www.ester.ee/record=b1238663*est Standardization of foreign language tests series ITAEinväli, E.; Kokkota, Valmar; Kukk, Helja-Amanda; Toomsalu, Marju; Tšetõrkina, Ene; Volgina, Olga; Võrk, Evi-Mai2nd regional seminar Testing in foreign language teaching : Tallinn, February 25-26, 1986 : summaries1986 / p. 32-35 https://www.ester.ee/record=b1217950*est Vastavushindamine [Võrguteavik] : nõuded juhtimissüsteemide auditit ja sertifitseerimist teostavatele asutustele. Osa 1, Nõuded = Conformity assessment : requirements for bodies providing audit and certification of management systems. Part 1, Requirements2016 http://www.ester.ee/record=b4572261*est