Columbia subject headings:
Alfonso X, King of Castile and Leon, 1221-1284--Bibliography.
Law--Spain--Castile--Bibliography.
Law--Spain--Leon (Kingdom)--Bibliography.
Harvard subject headings:
Alfonso X, King of Castile and Leon, 1221-1284--Bibliography.
Alfonso X, King of Castile and Leon, 1221-1284. Works--Bibliography.
Princeton subject headings:
Alfonso X, King of Castile and Leon, 1221-1284--Bibliography.
Law--Spain--Castile--Bibliography.
Law--Spain--Leon (Kingdom)--Bibliography.