Cita APA (7a ed.)

Hempel, C. G. (1969). Fundamentals of concept formation in empirical science. University Press.

Cita Chicago Style (17a ed.)

Hempel, Carl G. Fundamentals of Concept Formation in Empirical Science. Chicago: University Press, 1969.

Cita MLA (9a ed.)

Hempel, Carl G. Fundamentals of Concept Formation in Empirical Science. University Press, 1969.