Wren, P. (2006). High school english grammar and composition. S.Chand and company.
Chicago Style aipamenaWren, P.C. High School English Grammar and Composition. New Delhi: S.Chand and company, 2006.
MLA aipamenaWren, P.C. High School English Grammar and Composition. S.Chand and company, 2006.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.