Jain, V. (1995). `O`Level module IV: Problem solving in Basic. BPB.
Chicago-čujuhus (17. p.)Jain, V. `O`Level Module IV: Problem Solving in Basic. New Delhi: BPB, 1995.
MLA-čujuhus (9. p.)Jain, V. `O`Level Module IV: Problem Solving in Basic. BPB, 1995.
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