APA (7th ed.) Citation

Portal Valenzuela, B. (1988). Ecuador. Anaya.

Chicago Style (17th ed.) Citation

Portal Valenzuela, Bélfor. Ecuador. Madrid: Anaya, 1988.

MLA (9th ed.) Citation

Portal Valenzuela, Bélfor. Ecuador. Anaya, 1988.

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