Cita APA (7a ed.)

Freyre, G. (1961). Portuguese integration in the tropics: Notes concerning a possible. [s.n.].

Cita Chicago Style (17a ed.)

Freyre, Gilberto. Portuguese Integration in the Tropics: Notes Concerning a Possible. Lisbon: [s.n.], 1961.

Cita MLA (9a ed.)

Freyre, Gilberto. Portuguese Integration in the Tropics: Notes Concerning a Possible. [s.n.], 1961.