Cita APA (7th ed.)

Twentieth Century Fund & May, S. (1952). Costa Rica, a study in economic development. [s.n.

Cita Chicago (17th ed.)

Twentieth Century Fund i Stacy May. Costa Rica, a Study in Economic Development. New York: [s.n, 1952.

Cita MLA (9th ed.)

Twentieth Century Fund i Stacy May. Costa Rica, a Study in Economic Development. [s.n, 1952.