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.
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Martin, E.B. 1989.The rhino product trade in Northern and Western Borneo.Pachyderm 12: 38-41, figs. 1-3.
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Martin, E.B. 1989.Macao prohibits internal trade in rhino horn and musk.Traffic Bulletin 10 (3/4): 30.
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Vigne, L.; Martin, E.B. 1989.Kaziranga’s calamity – a new threat to the Indian rhino.Oryx 23 (3): 124-125, fig. 1.