Columbia subject headings:
Harvard subject headings:
Encina, Juan del, 1468-1529?--Language.
Rojas, Fernando de, -1541--Language.
Spanish language--Tense--History.
Spanish language--Tense.
Spanish language--To 1500--Verb.
Valdés, Juan de, -1541--Language.
Valdés, Juan de, -1541--Language.
Princeton subject headings:
Spanish language--Tense--History.