(2003). Basis 2003. Yayasan BP Basis.
Chicago Style aipamenaBasis 2003. Yayasan BP Basis, 2003.
MLA aipamenaBasis 2003. Yayasan BP Basis, 2003.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.
(2003). Basis 2003. Yayasan BP Basis.
Chicago Style aipamenaBasis 2003. Yayasan BP Basis, 2003.
MLA aipamenaBasis 2003. Yayasan BP Basis, 2003.