Cita APA

Northwestern University, Evanston, Ill. Dept. of Geography. (1952). The rural land classification program of Puerto Rico. s.n.

Citación estilo Chicago

Northwestern University, Evanston, Ill. Dept. of Geography. The Rural Land Classification Program of Puerto Rico. Evanston, Ill: s.n, 1952.

Cita MLA

Northwestern University, Evanston, Ill. Dept. of Geography. The Rural Land Classification Program of Puerto Rico. s.n, 1952.