Cita APA (7th ed.)
Langbein, L. I., & Lichtman, A. J. (1977). Ecological Inference,. Sage.
Cita Chicago (17th ed.)
Langbein, Laura Irwin, i Allan J. Lichtman. Ecological Inference,. Los Angeles, EUA: Sage, 1977.
Cita MLA (9th ed.)
Langbein, Laura Irwin, i Allan J. Lichtman. Ecological Inference,. Sage, 1977.
Atenció: Aquestes cites poden no estar 100% correctes.