2.) Corazon Salvaje 1993 for Mexican Spanish, and
3.) El Ministerio del Tiempo for Castilian Spanish, as a formerly dominant world language, now building awareness of racism, and fighting hatred on both continents.
4.) Astérix for French, because it is the other dominant world language, and shows European ways of thinking (to some extent, from a Gaulois point of view…).
and 5.) The Bible, because Hebrew is quite simple, and even when we do not know the origin of many phrases we use every day, this book set the framework for the way modern Westerners think today, even if it was, ironically, based on Bablyonian sources to a large extent. (later addition: Here is a bit of help for Soprano leyners(chanters) .. Read, Write, Dream, Teach ! ShiraDest, 8 March, 12016 HE)