Sin remedio, 1984: title page (Antonio Caballero) title page verso (Antonio Caballero C.) back cover (born 1945 in Bogotá; lived in Europe; comic strip author, translator, radio announcer, journalist; presently lives in Bogotá and writes a column for a Bogotá journal; also works for journal Cambio 16 of Madrid)

LC data base, October 30, 1986 (hdg.: Caballero, Antonio)

González, Sady. El saqueo de una ilusión : el 9 de abril, 50 años después, 1998: title page (textos, Antonio Caballero [and others]) page 72 (born 1948 in Bogotá)

Luis Caballero, 2007: title page (Antonio Caballero) jacket flap (Antonio Caballero Holguín; born 1945 in Bogotá; author of Sin remedio and El saqueo de una ilusión)

Literatura y periodismo, 2006: title page (Antonio Caballero H.)

Historia de Colombia y sus oligarquías, 2018: cover (Antonio Caballero) page 427 (Antonio Caballero; born 1945 in Bogotá; cartoonist, journalist and author; author of the novel Sin remedio)

Centro Colombiano de Derechos Reprográficos CDR website, June 22, 2021: (Antonio Ignacio Isidro Caballero Holguín; born 1945 in Bogotá; son of author Eduardo Caballero Calderón; newphew of author Lucas Caballero Calderón; brother of the artist Luis Caballero; graduated form the Gimnasio Moderno (K-12 school) in Bogotá; began studying law at the Universidad del Rosario without completing his degree because he moved to Paris in 1966 when his father became the ambassador to UNESCO; he studied political science in Paris; currently writes an opinion column for Revista Semana; author of Sin Remedio, novela (1984), Paisajes con Figuras (1997), and Los Siete Pilares del Toreo (2003)) https://cdr.com.co/directorio-de-autores/2260/antonio-ignacio-isidro-caballero-holguin/

Ministerio de Cultura (Colombia) website, June 22, 2021: posted December 2017 (Antonio Ignacio Isidro Caballero Holguín; author of Sin remedio) https://www.mincultura.gov.co/prensa/noticias/Documents/juridica/DICIEMBRE%20DE%202017.xlsx

Arquitrave : Revista Colombiana de Poesía website, June 22, 2021: interview with the author posted on January 15, 1994 (Antonio Caballero; born 1945 in Bogotá; grew up in Bogotá and Madrid) http://www.arquitrave.com/arquitraveantes/poetas/Antonio_Caballero/caballero_harold_alvarado.htm

Revista Semana (Bogotá) website, June 22, 2021: (Antonio Caballero; columnist; contactenos@semana.com) https://www.semana.com/autor/acaballero/