Day, S. (1980). The writer's workbook. McGraw-Hill.
Chicago Style (17th ed.) ZitazioaDay, Susan. The Writer's Workbook. New York: McGraw-Hill, 1980.
MLA (9th ed.) ZitazioaDay, Susan. The Writer's Workbook. McGraw-Hill, 1980.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.