APA (7th ed.) Zitazioa
(1996). The Forts of Old San Juan: San Juan National Historic Site, Puerto Rico.
Chicago Style (17th ed.) Zitazioa
The Forts of Old San Juan: San Juan National Historic Site, Puerto Rico. 1996.
MLA (9th ed.) Zitazioa
The Forts of Old San Juan: San Juan National Historic Site, Puerto Rico. 1996.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.