Tulfo, E. T. (2020). Patient recovery, economic recovery. IN Opinion [column]. Manila Standard.
Chicago-viite (17. p.)Tulfo, Erwin T. "Patient Recovery, Economic Recovery. IN Opinion [column]." Manila Standard 2020.
MLA-viite (9. p.)Tulfo, Erwin T. "Patient Recovery, Economic Recovery. IN Opinion [column]." Manila Standard, 2020.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.