Walter John Hayden

(1951– ) (W.J.Hayden)

• Webster, G.L., Berry, P.E., Armbruster, W.S., Esser, H.-J., Gillespie, L.J., Hayden, W.J., Levin, G.A., Secco, R.S., Heald, S.V. 1999. Euphorbiaceae. Pp. 72–228 in Steyermark, J.A. (†), Berry, P.E., Yatskievych, K. & Holst, B.K. (eds.), Flora of the Venezuelan Guayana, Vol. 5, Eriocaulaceae–Lentibulariaceae. Missouri Botanical Garden Press, St. Louis. ISBN 0-915279-71-1. Reference page.