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

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

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