APA (7th ed.) Citation

Purcell, J. (1997). Doctor linux: The complete linux reference documentation (5th ed.). Linux Systems Labs.

Chicago Style (17th ed.) Citation

Purcell, John. Doctor Linux: The Complete Linux Reference Documentation. 5th ed. [Χ.τ.]: Linux Systems Labs, 1997.

MLA (9th ed.) Citation

Purcell, John. Doctor Linux: The Complete Linux Reference Documentation. 5th ed. Linux Systems Labs, 1997.