Sourcing Pandemic News: A Cross-National Computational Analysis of Mainstream Media Coverage of COVID-19 on Facebook, Twitter, and Instagram - Claudia Mellado; Daniel C. Hallin; Luís Cárcamo-Ulloa; Rodrigo Alfaro; Daniel Jackson; María Luisa Humanes; Mireya Márquez-Ramírez; Jacques Mick; Cornelia Mothes; Christi I-Hsuan Lin; Misook Lee; Amaranta Alfaro; et al. (Covering Covid-19, 2024)