Sorenson, S. (1998). How to write research papers (2nd.). Thomson Learning.
Chicago Style aipamenaSorenson, Sharon. How to Write Research Papers. 2nd. Cincinnati: Thomson Learning, 1998.
MLA aipamenaSorenson, Sharon. How to Write Research Papers. 2nd. Thomson Learning, 1998.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.