APA aipamena

Chamot, A. U. (2008). Workbook Longman Keystone. Pearson Longman.

Chicago Style aipamena

Chamot, Anna Uhl. Workbook Longman Keystone. Pearson Longman, 2008.

MLA aipamena

Chamot, Anna Uhl. Workbook Longman Keystone. Pearson Longman, 2008.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.