Sorenson, S. (1999). The research paper: A contemporary approach. Amsco School Publications.
Chicago Style aipamenaSorenson, Sharon. The Research Paper: A Contemporary Approach. New York: Amsco School Publications, 1999.
MLA aipamenaSorenson, Sharon. The Research Paper: A Contemporary Approach. Amsco School Publications, 1999.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.