APA-čujuhus (7. p.)

Singh, V. (1999). `O` level text-book: Module III : business systems........... Asian pub.

Chicago-čujuhus (17. p.)

Singh, Vishun. `O` Level Text-book: Module III : Business Systems........... Delhi: Asian pub, 1999.

MLA-čujuhus (9. p.)

Singh, Vishun. `O` Level Text-book: Module III : Business Systems........... Asian pub, 1999.

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