Iván Calero (English Wikipedia)

"Derby 1-0 Charlton". BBC Sport. 26 August 2014. Retrieved 26 August 2014.
"Nottm Forest 1-1 Derby". BBC Sport. 14 September 2014. Retrieved 14 September 2014.
"Transfer Deadline Day: Derby's Calero joins Burton on loan". BBC Sport. 2 February 2015. Retrieved 2 February 2015.
"Ivan Calero: Hero Hasselbaink influenced Burton loan move". BBC Sport. 5 February 2015. Retrieved 2 March 2015.
"Cheltenham 1-3 Burton". BBC Sport. 7 February 2015. Retrieved 7 February 2015.
"Burton 0-0 Wimbledon". BBC Sport. 10 February 2015. Retrieved 11 February 2015.
"Cambridge 2-3 Burton". BBC Sport. 2 May 2015. Retrieved 2 May 2015.
"Derby 0-3 Reading". BBC Sport. 2 May 2015. Retrieved 2 May 2015.

bdfutbol.com

"Iván Calero, nuevo jugador del CD Numancia" [Iván Calero, new player of CD Numancia] (in Spanish). CD Numancia. 8 July 2019. Retrieved 9 July 2019.

"Iván Calero, Pablo González y Sergio Molina, nuevas incorporaciones del Salamanca UDS" [Iván Calero, Pablo González and Sergio Molina, new additions of Salamanca UDS] (in Spanish). CF Salmantino. 27 July 2018. Archived from the original on 27 July 2018. Retrieved 27 July 2018.

"El padre de Iván Calero, segundo de Fernando Hierro en la Selección Española" [Iván Calero's father, Fernando Hierro's number two in the Spanish national team]. Diario de Información (in Spanish). 13 June 2018. Retrieved 25 February 2019.

"OFICIAL | El Elche incorpora a Iván Calero" [OFFICIAL | Elche sign Iván Calero] (in Spanish). Elche CF. 8 July 2017.

"Iván Calero, velocidad y habilidad para el lateral derecho albinegro" [Iván Calero, speed and skill for the white-and-black right back] (in Spanish). FC Cartagena. 3 July 2022. Retrieved 2 August 2022.

"El carril derecho se fortalece con Iván Calero" [The right flank is bolstered with Iván Calero] (in Spanish). Málaga CF. 28 August 2020. Retrieved 29 August 2020.
"Calero loaned out to AD Alcorcón". Málaga CF. 15 January 2022. Retrieved 16 January 2022.

"Iván Calero, nuevo jugador del Real Zaragoza" [Iván Calero, new player of Real Zaragoza] (in Spanish). Real Zaragoza. 16 July 2024. Retrieved 16 July 2024.

El Leganés se aferra a Butarque (Leganés holds on to Butarque) Archived 2016-03-04 at the Wayback Machine; Vavel, 9 September 2012 (in Spanish)
Sparta Rotterdam haalt Iván Calero Ruiz Archived 2016-06-05 at the Wayback Machine; Sparta Rotterdam, 2 June 2016
"Iván Calero, Pablo González y Sergio Molina, nuevas incorporaciones del Salamanca UDS" [Iván Calero, Pablo González and Sergio Molina, new additions of Salamanca UDS] (in Spanish). CF Salmantino. 27 July 2018. Archived from the original on 27 July 2018. Retrieved 27 July 2018.