APA-referens (7:e uppl.)

Castillo, G. T. (2009). Growing old gracefully, not grudginly. IN Educators speak [column]. Manila Bulletin.

Chicago-referens (17:e uppl.)

Castillo, Gelia T. "Growing Old Gracefully, Not Grudginly. IN Educators Speak [column]." Manila Bulletin 2009.

MLA-referens (9:e uppl.)

Castillo, Gelia T. "Growing Old Gracefully, Not Grudginly. IN Educators Speak [column]." Manila Bulletin, 2009.