Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

Hempel, Carl G. Philosophy of Natural Science. Englewood Cliffs, NJ: Prentice-Hall, 1966.

Cita MLA (9th ed.)

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