solo vs sólo

"No se puede aprender un lenguaje por solo libros" was the given answer. If the sense is "solamente", isn't it "sólo"?

Hola amigo! "Solamente" could fit in that sentece, but minor changes would have to be make, something like : "No se puede aprender un lenguaje solamente por libros". The other option i could find would be just removing the "por"; "No se puede aprender un lenguaje con libros solamente". I think is just a matter of arraging the words in the sentence. saludos!