APA

Hernández D. D., . (1973). Methodological considerations underlying the definition of the "Puerto Rican syndrome" / by David D. Hernández [and] Pedro Vales. New York: [s.n.].

Chicago

Hernández David D, . 1973. Methodological considerations underlying the definition of the "Puerto Rican syndrome" / by David D. Hernández [and] Pedro Vales. New York: [s.n.].

Harvard

Hernández D. D., . (1973). Methodological considerations underlying the definition of the "Puerto Rican syndrome" / by David D. Hernández [and] Pedro Vales. New York: [s.n.].

MLA

Hernández David D, . Methodological considerations underlying the definition of the "Puerto Rican syndrome" / by David D. Hernández [and] Pedro Vales. New York: [s.n.]. 1973.