IRRI. (1979). Nitrogen and rice. Philippines: IRRI.
Chicago Style aipamenaIRRI. Nitrogen and Rice. Philippines: IRRI, 1979.
MLA aipamenaIRRI. Nitrogen and Rice. Philippines: IRRI, 1979.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.
APA aipamena