(2002). General studies manual 2002.
Chicago Style aipamenaGeneral Studies Manual 2002. TATA McGraw-Hill Publishing Co., New Delhi, 2002.
MLA aipamenaGeneral Studies Manual 2002. 2002.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.
(2002). General studies manual 2002.
Chicago Style aipamenaGeneral Studies Manual 2002. TATA McGraw-Hill Publishing Co., New Delhi, 2002.
MLA aipamenaGeneral Studies Manual 2002. 2002.