APA (7th ed.) Citation

Quental, A. d., & Martins, p. O. (1980). Sonetos. Ulmeiro.

Chicago Style (17th ed.) Citation

Quental, Antero de, and pref. Oliveira Martins. Sonetos. Ulmeiro, 1980.

MLA (8th ed.) Citation

Quental, Antero de, and pref. Oliveira Martins. Sonetos. Ulmeiro, 1980.

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