Cita APA (7th ed.)

DOEACC Society. (2001). Quanbook `O` level: Model questions Vol III Business systems...... BPB.

Cita Chicago (17th ed.)

DOEACC Society. Quanbook `O` Level: Model Questions Vol III Business Systems...... New Delhi: BPB, 2001.

Cita MLA (9th ed.)

DOEACC Society. Quanbook `O` Level: Model Questions Vol III Business Systems...... BPB, 2001.