Columbia subject headings:
Manners and customs.
Ruiz, Juan, approximately 1283-approximately 1350--Knowledge and learning.
Ruiz, Juan, approximately 1283-approximately 1350. Libro de buen amor.
Harvard subject headings:
Ruiz, Juan, active 1343. Libro de buen amor.
Ruiz, Juan, approximately 1283-approximately 1350--Knowledge--Manners and customs.
Ruiz, Juan, approximately 1283-approximately 1350--Knowledge--Social life and customs.
Ruiz, Juan, approximately 1283-approximately 1350. Libro de buen amor.
Princeton subject headings:
Ruiz, Juan, approximately 1283-approximately 1350--Knowledge--Manners and customs.
Ruiz, Juan, approximately 1283-approximately 1350. Libro de buen amor.