APA

Ramsar, . (1999). A directory of wetlands of international importances. San José: Ramsar.

Chicago

Ramsar, . 1999. A directory of wetlands of international importances. San José: Ramsar.

Harvard

Ramsar, . (1999). A directory of wetlands of international importances. San José: Ramsar.

MLA

Ramsar, . A directory of wetlands of international importances. San José: Ramsar. 1999.