Villegas, B. M. (2000). It's strategic planning time again. IN Business and society [column]. Manila Bulletin.
Chicago-viite (17. p.)Villegas, Bernardo M. "It's Strategic Planning Time Again. IN Business and Society [column]." Manila Bulletin 2000.
MLA-viite (9. p.)Villegas, Bernardo M. "It's Strategic Planning Time Again. IN Business and Society [column]." Manila Bulletin, 2000.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.