APA (7e ed.) Bronvermelding

Katigbak, A. F. (2005). More than 50% of women with osteoporosis worldwide suffer from Vitamin D inadequacy. Philippine Star.

Chicago (17e ed.) Bronvermelding

Katigbak, Antonio F. "More than 50% of Women with Osteoporosis Worldwide Suffer from Vitamin D Inadequacy." Philippine Star 2005.

MLA (9e ed.) Bronvermelding

Katigbak, Antonio F. "More than 50% of Women with Osteoporosis Worldwide Suffer from Vitamin D Inadequacy." Philippine Star, 2005.