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

Exercises in English grammarVolgina, Olga1993 https://www.ester.ee/record=b1064399*est

Home-reading texts for second-year students of mechanical engineeringVolgina, Olga1987 https://www.ester.ee/record=b1249357*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

Word-building : English grammar exercises1988 https://www.ester.ee/record=b1247074*est