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Sparenberg, J.A. (author), de Vries, J. (author) report 1983
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Sparenberg, Johan Adolf (author) report 1982
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Slijper, C.A. (author), Sparenberg, J.A. (author) report 1971
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Potze, Willem (author), Sparenberg, J.A. (author) report
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Schmidt, G.H. (author), Sparenberg, J.A. (author) report
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Sparenberg, Johan Adolf (author) report
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Sparenberg, Johan Adolf (author) report
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Sparenberg, Johan Adolf (author) report
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Sparenberg, J.A. (author) report 1969