@Misc{BVMC:260350,
author = {Wensell, Ulises},
title = {Ilustraciones para "Valentin hilft seinen Freunden"},
publisher = {Alicante : Biblioteca Virtual Miguel de Cervantes, 2009},
year = {2009},
url = {https://www.cervantesvirtual.com/nd/ark:/59851/bmcd5137}
}