Ong, R. (2017). Pictorial guide to orchid culture (part 1). IN Hortitech [column]: Orchid pollination. Philippine Star.
Citazione stile Chigago Style (17a edizione)Ong, Ray. "Pictorial Guide to Orchid Culture (part 1). IN Hortitech [column]: Orchid Pollination." Philippine Star 2017.
Citatione MLA (9a ed.)Ong, Ray. "Pictorial Guide to Orchid Culture (part 1). IN Hortitech [column]: Orchid Pollination." Philippine Star, 2017.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.