APA

Langbein L. I., Langbein L. I. & Lichtman A. J. (1978). Ecological inference. Beverly Hills [u.a.]: Sage.

Chicago

Langbein Laura I, Langbein Laura I and Lichtman Allan J. 1978. Ecological inference. Beverly Hills [u.a.]: Sage.

Harvard

Langbein L. I., Langbein L. I. and Lichtman A. J. (1978). Ecological inference. Beverly Hills [u.a.]: Sage.

MLA

Langbein Laura I, Langbein Laura I and Lichtman Allan J. Ecological inference. Beverly Hills [u.a.]: Sage. 1978.