கேள்வி: பெர்னார்டு ஆல்டம் - பணிகள் பற்றி விளக்கவும்.
பதில்: *''Homeri cum Aeschyli, Sophoclis, Euripidis comparantur'', (dissertation), Berlin 1855. *''Winke zur Hebung des zoologischen Unterrichts'' (a zoology instruction manual), Münster 1863. *''Die Säugetiere des Münsterlands'', Münster (Mammals of "Münster country"), 1867. *''Der Vogel und sein Leben'', Münster 1868 (Birds and their lives); published in several editions, 7th edition 1903. *''Forstzoologie'' (Forest zoology; volume 1: mammals, volume 2: birds, volume 3: insects; general insects and beetles). ** I. ''Säugethiere''. Second improved and enlarged edition, published by Julius Springer, Berlin 1876. ** II. ''Vögel''. published by Julius Springer, Berlin 1873. ** III. ''Insecten. 1. Abth. Allgemeines und Käfer''. Second improved and enlarged edition, published by Julius Springer, Berlin 1881.[http://de.wikisource.org/wiki/Bernard_Altum Deutsche Wikisource] (bibliography)