Kaufman, K. (2001). Direct amendments, mas ok kaysa Concon-Angara. Kabayan.
Chicago Style aipamenaKaufman, Karl. "Direct Amendments, Mas Ok Kaysa Concon-Angara." Kabayan 2001.
MLA aipamenaKaufman, Karl. "Direct Amendments, Mas Ok Kaysa Concon-Angara." Kabayan, 2001.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.