Howe, R. J. (1993). Quality on trial. New York: West Publishing Company.
Chicago Style aipamenaHowe, Roger J. Quality On Trial. New York: West Publishing Company, 1993.
MLA aipamenaHowe, Roger J. Quality On Trial. New York: West Publishing Company, 1993.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.