Cita APA (7th ed.)
Blalock, H. M. (1972). Causal inferences in non experimental research.
Cita Chicago (17th ed.)
Blalock, Hubert M. Causal Inferences in Non Experimental Research. 1972.
Cita MLA (9th ed.)
Blalock, Hubert M. Causal Inferences in Non Experimental Research. 1972.
Atenció: Aquestes cites poden no estar 100% correctes.