Cita APA (7a ed.)

Hartmann, E. (1998). The functions of sleep. University Microfilms International.

Cita Chicago Style (17a ed.)

Hartmann, Ernest. The Functions of Sleep. Ann Arbor: University Microfilms International, 1998.

Cita MLA (9a ed.)

Hartmann, Ernest. The Functions of Sleep. University Microfilms International, 1998.