Campodónico, Miguel Angel (1 January 2003). "Rein, Mercedes". Nuevo diccionario de la cultura uruguaya [New Dictionary of Uruguayan Culture] (in Spanish). Linardi y Risso. p. 2028. ISBN9789974559318. Retrieved 6 August 2018 – via Google Books.
Sum Scott, Renée (2002). "Mercedes Rein (1931)". Escritoras uruguayas: una antología critica [Uruguayan Women Writers: A Critical Anthology] (in Spanish). Ediciones Trilce. p. 72. ISBN9789974323124. Retrieved 6 August 2018 – via Google Books.
Alzugarat, Alfredo (2007). "Nelson Marra y 'El guardaespaldas'". Trincheras de papel: dictadura y literatura carcelaria en Uruguay [Paper Trenches: Dictatorship and Prison Literature in Uruguay] (in Spanish). Ediciones Trilce. p. 123. ISBN9789974324527. Retrieved 6 August 2018 – via Google Books.
Capagorry, Juan; Rodríguez Barilari, Elbio; Martins, Carlos (1980). Aquí se canta: canto popular, 1977–1980 [Sung Here: Popular Song, 1977–1980] (in Spanish). Arca. p. 86. Retrieved 6 August 2018 – via Google Books.
Origgioni, Alberto (2001). "Rein, Mercedes". Nuevo diccionario de la cultura uruguaya [New Dictionary of Uruguayan Culture] (in Spanish). Retrieved 6 August 2018 – via espaciolatino.com.