APA (7th ed.) Citation

Viana, A. M. C. (1969). Arco-Iris. Verbo.

Chicago Style (17th ed.) Citation

Viana, António Manuel Couto. Arco-Iris. Verbo, 1969.

MLA (8th ed.) Citation

Viana, António Manuel Couto. Arco-Iris. Verbo, 1969.

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