Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (9a ed.)

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