APA aipamena

M. Gabb, W. (2007). On the Geology of the Republic of Costa Rica.

Chicago Style aipamena

M. Gabb, William. On the Geology of the Republic of Costa Rica. 2007.

MLA aipamena

M. Gabb, William. On the Geology of the Republic of Costa Rica. 2007.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.