Insight. New York: Macmillan, McGraw - Hill.
Chicago Style aipamenaInsight. New York: Macmillan, McGraw - Hill.
MLA aipamenaInsight. New York: Macmillan, McGraw - Hill.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.
Insight. New York: Macmillan, McGraw - Hill.
Chicago Style aipamenaInsight. New York: Macmillan, McGraw - Hill.
MLA aipamenaInsight. New York: Macmillan, McGraw - Hill.