Alejandro, G. J. D., Balete, I. K. C., Caagbay, J. F. C., Cruz, J. M. M. B., Narciso, C. J. C., Nazareno, D. E., . . . Uy, M. M. (2011). Polyphyly of Bikkia Reinw. [Rubiaceae] based on multi-locus sequence analysis [ITS, rps16, trnl-F], with emphasis on the endemic Bikkia philippinensis val. including its conservation status. Acta Manilana.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Alejandro, Grecebio Jonathan D., Ian Kevin C. Balete, Julian Fabian C. Caagbay, Jana May Marie B. Cruz, Christine Joy C. Narciso, Dominic E. Nazareno, Cecilia I. Banag, و Millard M. Uy. "Polyphyly of Bikkia Reinw. [Rubiaceae] Based on Multi-locus Sequence Analysis [ITS, Rps16, Trnl-F], with Emphasis on the Endemic Bikkia Philippinensis Val. Including Its Conservation Status." Acta Manilana 2011.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Alejandro, Grecebio Jonathan D., et al. "Polyphyly of Bikkia Reinw. [Rubiaceae] Based on Multi-locus Sequence Analysis [ITS, Rps16, Trnl-F], with Emphasis on the Endemic Bikkia Philippinensis Val. Including Its Conservation Status." Acta Manilana, 2011.