Cita APA (7a ed.)

Hempel, C. G. (1966). Philosophy of natural science. Prentice Hall.

Cita Chicago Style (17a ed.)

Hempel, Carl G. Philosophy of Natural Science. Londres, Inglaterra: Prentice Hall, 1966.

Cita MLA (9a ed.)

Hempel, Carl G. Philosophy of Natural Science. Prentice Hall, 1966.