Cita APA (7th ed.)

Blalock, H. M. (1964). Causal inferences in nonexperimental research. University of North Carolina.

Cita Chicago (17th ed.)

Blalock, Hubert M. Causal Inferences in Nonexperimental Research. Chapel Hill: University of North Carolina, 1964.

Cita MLA (9th ed.)

Blalock, Hubert M. Causal Inferences in Nonexperimental Research. University of North Carolina, 1964.