Vigne, L.; Martin, E.B. 1990. Increasing threats to Assam’s rhinos. International Zoo News 37 (7): 28-30, figs. 1-3.
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Martin, E.B. 1990. Survey of wildlife products for sale in Saudi Arabia, with particular emphasis on rhino horn. Traffic Bulletin 11 (4): 66-68, map 1, tables 1-2.
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Ryan, T.C.I.; Martin, E.B. 1990. How much rhino horn has come onto international markets since 1970?. Pachyderm 13: 20-25, figs. 1-4.
Martin, E.B.; Vigne, L.; Mugabe, R.; Tatham, G. 1987. La diplomatie au secours des rhinos [E.B. Martin heads to Yemen and Zimbabwe’s efforts to protect black rhino]. Nature et Faune 3 (Jul-Sep) No. 3: 32-34, 1 image (from BBC Wildlife).