Παραπομπή APA

Swineford, F. (1948). A study in factor analysis: The nature of the general,verbal, and spatial bi-factors. University of Chicago Press.

Παραπομπή Chicago Style

Swineford, Frances. A Study in Factor Analysis: The Nature of the General,verbal, and Spatial Bi-factors. Chicago: University of Chicago Press, 1948.

Παραπομπή MLA

Swineford, Frances. A Study in Factor Analysis: The Nature of the General,verbal, and Spatial Bi-factors. University of Chicago Press, 1948.