Template:Seah & Wong, 2018
- Seah, W.W. & Wong, K.M. 2018. Flora of Singapore precursors, 7: A newly diagnosed species of Neonauclea (Rubiaceae: Naucleeae) now extinct in Singapore and notes on Neonauclea excelsa and N. calycina. Gardens' Bulletin Singapore 70(2): 289–294. DOI: 10.26492/gbs70(2).2018-05
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