Lumsden, R. (1993). Twenty-three steps to success and achievement. Indus.
Chicago-čujuhus (17. p.)Lumsden, Robert. Twenty-three Steps to Success and Achievement. New delhi: Indus, 1993.
MLA-čujuhus (9. p.)Lumsden, Robert. Twenty-three Steps to Success and Achievement. Indus, 1993.
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