APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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

Warning: These citations may not always be 100% accurate.