Kozminska, Urszula y Ruiz Allén, Nacho, Time Matters, Ruby Press, Berlin, 2024
Foote, Jonathan, López Arraiza, Sara y Ruiz Allén, Nacho, Miradas convergentes en torno a la arquitectura nórdica, Fundación Arquia, Madrid, 2023
Ahrenkiel, Andriette, López Arraiza, Sara and Ruiz Allén, Nacho, The Nordic and Spain. An Architectural Journey, The Architectural Publisher B, Copenhague, 2022
López Arraiza, Sara and Ruiz Allén, Nacho, Learning from Las Cuencas. Towards Highlighting the Cultural Landscape of the Coalfields, Eujoa, Oviedo, 2014