Tirona, G. A. (1998). The family corporation: A new breeding ground for gurus. Philippine Star.
Chicago-viite (17. p.)Tirona, Gertie Ampil. "The Family Corporation: A New Breeding Ground for Gurus." Philippine Star 1998.
MLA-viite (9. p.)Tirona, Gertie Ampil. "The Family Corporation: A New Breeding Ground for Gurus." Philippine Star, 1998.
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