Dewi Marlina Siregar, Yakob Wanggai, Nurhaidah Iriany Sinaga dan Yubelince Runtuboy(Herbarium Bogoriense Botany Division Research Centre for Biology – LIPI Cibinong, Indonesia, 2006-05-12)
Ika Sulaiman, Nurhaidah Iriany Sinaga dan Yubelince Runtuboy(Herbarium Bogoriense Botany Division Research Centre for Biology – LIPI Cibinong, Indonesia, 2009-05-01)