Ong, R. (2018). Guide to simple-leaf aspleniums in the Philippines. IN Philippine gardens [column]. Philippine Star.
Citazione stile Chigago Style (17a edizione)Ong, Ray. "Guide to Simple-leaf Aspleniums in the Philippines. IN Philippine Gardens [column]." Philippine Star 2018.
Citatione MLA (9a ed.)Ong, Ray. "Guide to Simple-leaf Aspleniums in the Philippines. IN Philippine Gardens [column]." Philippine Star, 2018.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.