^Greene, David Mason. Greene's Biographical Encyclopedia of Composers, Reproducing Piano Roll Fnd., (1985) (ردمك 0-385-14278-1), p. 442
^Fisher، Stephen (1983). Friedrich Witt (1770–1836), Anton Eberl (1765–1807), symphonic works : thematic index. Unknown, Possibly Garland Publishing. OCLC:475343768. Published the same year as Garland Publishing's edition (by Fisher) of Witt's symphony in D (Thematic Index FisW 2.) The الدليل الدولي للمصادر الموسيقية[لغات أخرى] catalog online lists 15 (and one fragmentary - unfinished?) of Witt's symphonies with manuscript copy (or other source) locations and Fisher thematic catalogue numbers, but assuming none of the works before no. 23- the last, fragmentary one, they list- are also unfinished, that still leaves 18 Witt symphonies (since their database includes a listing of his symphony catalog no. 18.)
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