Cita APA (7a ed.)

Barry, P. M. (2011). Completions (1a. ed.). PetroSkills.

Cita Chicago Style (17a ed.)

Barry, Paul M. Completions. 1a. ed. Oklahoma: PetroSkills, 2011.

Cita MLA (8a ed.)

Barry, Paul M. Completions. 1a. ed. PetroSkills, 2011.