Columbia subject headings:
Balboa, Vasco Núñez de, 1475-1519--Drama.
Camões, Luís de, 1524?-1580--Drama.
Harvard subject headings:
Balboa, Vasco Núñez de, 1475-1519 in fiction, drama, poetry, etc.
Balboa, Vasco Núñez de, 1475-1519. in drama.
Camões, Luís de, 1524?-1580 in fiction, drama, poetry, etc.
Princeton subject headings: