White, C.T. & Francis, W.D. (1924), Contributions to the Queensland Flora, No. 2. Proceedings of the Royal Society of Queensland 35: 79, textfig. 8 [tax. nov.]

• Type: Placospermum coriaceum C.White & Francis

Wrigley, J.W. & Fagg, M. (1989), Banksias, Waratahs & Grevilleas and all other plants in the Australian Proteaceae family: 311 [secondary reference]

• Etymology: "From Greek, plax, a flat body. and sperma, a seed, referring to the flat seeds."

Weston, P.H. in McCarthy, P.M. (ed.) (1995), Proteaceae subfam. 1. Persoonioideae. Flora of Australia 16: 47 APC [secondary reference]

• APC Dist.: Qld

Cooper, W.E. & Cooper, W.T. (2004), Fruits of the Australian Tropical Rainforest: 420 [secondary reference]

Weston, P.H. & Barker, N.P. (13 November 2006), A new suprageneric classification of the Proteaceae, with an annotated checklist of genera. Telopea 11(3): 230 [secondary reference]

Weston, P.H. in Kubitzki, K. (ed.) (2007), Proteaceae. The Families and Genera of Vascular Plants 9: 383, Fig. 133 [secondary reference]

Mabberley, D.J. (1 May 2008), Mabberley's Plant-Book Edn. 3: 674 [secondary reference]

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