?????????, ??????, ??? . 1992. ??????????? ? ??????????? ?????????????? ??????????? ? ???????? ?? ??????????? ?? ???????? ?????????? ??????. ?????????????? ??????????? / ???????????????? ??????????? / Contrastive linguistics 17. (?????????????? ??????????? / ???????????????? ??????????? / Contrastive Linguistics). 84?91.

?????????, ??????, ??? . 1990. ???????? ????? ???????????????? ? ?????????? ????????? (????? ?????-????????? ????????). ?????????????? ??????????? / ???????????????? ??????????? / Contrastive linguistics 15. (?????????????? ??????????? / ???????????????? ??????????? / Contrastive Linguistics). 14?21.

?????????, ??????, ??? . 1986. ?????? ?. ?????????? (1923?1985). ?????????????? ??????????? / ???????????????? ??????????? / Contrastive linguistics 11. (?????????????? ??????????? / ???????????????? ??????????? / Contrastive Linguistics). 131?132.

?????????, ?????? & ?????????  ??????, ???-?? . 1978. ???????????? ?? ?????????? ????? ? ???????? ?? ???????. ?????????????? ??????????? / ???????????????? ??????????? / Contrastive linguistics 3. (?????????????? ??????????? / ???????????????? ??????????? / Contrastive Linguistics). 95?96.

?????????, ??????, ??? . 1977. ????????? ???????????? ??????? ? ????????? ? ????????? ???? (Subordinate predication units in English and Bulgarian). ?????????????? ??????????? / ???????????????? ??????????? / Contrastive linguistics 2. (?????????????? ??????????? / ???????????????? ??????????? / Contrastive Linguistics). 3?43.