1. On the grammatical notion, subject;Bavin,1980
2. Givenness, contrastiveness, definiteness, subjects, topics, and points of view;Chafe,1976
3. Some thoughts on agentivity;Cruse;Journal of Linguistics,1973
4. The positional tendencies of sentential noun phrases in universal grammar;Dryer,1979
5. Linguistic stylistics;Enkvist,1973