Cita APA (7a ed.)

Hydrographic Office. (1956). Rivers Uruguay, Paraná and Paraguay. South America East Coast. s.n.].

Cita Chicago Style (17a ed.)

Hydrographic Office. Rivers Uruguay, Paraná and Paraguay. South America East Coast. [s.l.: s.n.], 1956.

Cita MLA (8a ed.)

Hydrographic Office. Rivers Uruguay, Paraná and Paraguay. South America East Coast. s.n.], 1956.