Puig-Samper, M. Ángel y Rebok, S. 2010. Charles Darwin and Alexander von Humboldt: An exchange of looks between two famous naturalists. HiN – Alejandro de Humboldt en la Red. Revista internacional de estudios humboldtianos. 11, 21 (abr. 2010), 55–64. DOI:https://doi.org/10.18443/145.