?????, ????????. 2000. ???????????? ?? ??????? ??????. ?????????????? ??????????? / ???????????????? ??????????? / Contrastive linguistics 25. (?????????????? ??????????? / ???????????????? ??????????? / Contrastive Linguistics). 135?144.

?????, ????????. 1996. ???????????? ?? ????????? ??????. ?????????????? ??????????? / ???????????????? ??????????? / Contrastive linguistics 21. (?????????????? ??????????? / ???????????????? ??????????? / Contrastive Linguistics). 120?123.

?????, ???????? & ??????  ?????. 1992. ???????????? ?? ????????? ?? ?????? ???????. ?????????????? ??????????? / ???????????????? ??????????? / Contrastive linguistics 17. (?????????????? ??????????? / ???????????????? ??????????? / Contrastive Linguistics). 90?94.

?????, ???????? & ??????  ?????. 1991. ???????????? ?? ????????? ?? ????? ????????. ?????????????? ??????????? / ???????????????? ??????????? / Contrastive linguistics 16. (?????????????? ??????????? / ???????????????? ??????????? / Contrastive Linguistics). 101?108.