APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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