APA

Castrillo P., . (1947). Valle y mundo. New York: Spanish-American Priting.

Chicago

Castrillo Primo, . 1947. Valle y mundo. New York: Spanish-American Priting.

Harvard

Castrillo P., . (1947). Valle y mundo. New York: Spanish-American Priting.

MLA

Castrillo Primo, . Valle y mundo. New York: Spanish-American Priting. 1947.