APA (7th ed.) Citation

Camões, L. d., & Lourdes, p. M. d. Sonetos. Europa-América.

Chicago Style (17th ed.) Citation

Camões, Luís de, and pref. Maria de Lourdes. Sonetos. Europa-América.

MLA (8th ed.) Citation

Camões, Luís de, and pref. Maria de Lourdes. Sonetos. Europa-América.

Warning: These citations may not always be 100% accurate.