Rookmaaker, L.C.; Monson, J. 2000.Woodcuts and engravings illustrating the journey of Clara, the most popular rhinoceros of the eighteenth century.Zoologische Garten 70 (5): 313-335, figs. 1-11, table 1.
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Rookmaaker, L.C. 2000.The alleged population reduction of the southern white rhinoceros (Ceratotherium simum simum) and the successful recovery.Saugetierkundliche Mitteilungen 45 (2): 55-70, fig.1, tables 1-2.
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Rookmaaker, L.C. 1999.Tracking the rhinoceros – share your experiences.Mitteilungen der Namibia Wissenschaftlichen Gesellschaft 40: 2.