Труды экономического факультета
Halling, Aimar
;
Raudjärv, Matti
;
Reisenbuk, Helgi-Annika
;
Kamratov, Ardo
;
Sillaste, Juhan
;
Rääk, V.
;
Lumiste, Rein
;
Napa, Karin
;
Josing, Marje
1989
https://www.ester.ee/record=b1248858*est