Παραπομπή APA

Langbein, L., & Lichtman, A. (1978). Ecological inference. Sage.

Παραπομπή Chicago Style

Langbein, Laura, και Allan Lichtman. Ecological Inference. California: Sage, 1978.

Παραπομπή MLA

Langbein, Laura, και Allan Lichtman. Ecological Inference. Sage, 1978.