एपीए उद्धरण

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

शिकागो स्टाइल उद्धरण

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

एमएलए उद्धरण

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