(1989). Test booklet: (Blue level). New York: Mc Dougal, Littel & Company.
Chicago Style aipamenaTest Booklet: (Blue Level). New York: Mc Dougal, Littel & Company, 1989.
MLA aipamenaTest Booklet: (Blue Level). New York: Mc Dougal, Littel & Company, 1989.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.