Kirn, E., & Jack, D. (2007). Interactions 1: Grammar. New York: McGraw-Hill/Contemporary.
Chicago Style aipamenaKirn, Elaine, và Darcy Jack. Interactions 1: Grammar. New York: McGraw-Hill/Contemporary, 2007.
MLA aipamenaKirn, Elaine, và Darcy Jack. Interactions 1: Grammar. New York: McGraw-Hill/Contemporary, 2007.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.