Cita APA (7th ed.)

Elston, T. (2003). Microsoft office powerpoint 2003: Level 2. Element K.

Cita Chicago (17th ed.)

Elston, Tom. Microsoft Office Powerpoint 2003: Level 2. Portland: Element K, 2003.

Cita MLA (9th ed.)

Elston, Tom. Microsoft Office Powerpoint 2003: Level 2. Element K, 2003.