DOEACC Society. (2001). Quanbook `O` level: Model questions Vol II PC Software. BPB.
Čikaški stil citiranja (17. izdanje)DOEACC Society. Quanbook `O` Level: Model Questions Vol II PC Software. New Delhi: BPB, 2001.
MLA način citiranja (9. izdanje)DOEACC Society. Quanbook `O` Level: Model Questions Vol II PC Software. BPB, 2001.
Upozorenje: Ovi citati možda nisu uvijek 100% točni.