Cita APA (7th ed.)

Blalock, H. M. (1972). Casual inferences in nonexperimental research. Norton.

Cita Chicago (17th ed.)

Blalock, Hubert M. Casual Inferences in Nonexperimental Research. New York: Norton, 1972.

Cita MLA (9th ed.)

Blalock, Hubert M. Casual Inferences in Nonexperimental Research. Norton, 1972.