I am looking for reliable sources regarding the capture of the bridge at Tabor by Marshals Murat and Lannes in November 1805, however I am struggling to find any mention of it.
The Surprise of the Tabor Bridge..." by Huidekoper (p. 513)
The archival sources are of course the most reliable. Belliard's account is contained in his correspondence of November 23, 1805, to Berthier. See also the 5th Corps Journal for November 15, 1805. Then there is the Austrian point of view by Karl August Schwimmer, Die Franzosischen Invasion in Osterreich und die Franzosen in Wien in den Jahren 1805 und 1809, and Frederick Huidekoper's 1905 article in The Military Service Institution of the United States Journal.
In addition to the colorful non-eyewitness Marbot, add Grouchy's and de Segur's memoirs for other brief mentions.
An eyewitness of the incident was Général de division Belliard, who was Murat's chief of staff. You can find a decription of the action in the book written by General Derrecagaix in 1908 "Les états-major de Napoleon. Le lieutenant-général Comte Belliard. Chef d'état major de Murat" published 1908 in Paris on page 328-330.
Jean Rapp wrote also about it in his memoirs.
One place to begin any research into the incident might be Marbot's Memoirs. Even though Marbot definitely has a problem 'remembering with advantages' he was not present at the incident, which Marbot refers to as a 'not wholly creditable trick', but apparently heard of the incident second or third-hand. He arrived in Vienna after Napoleon and the Grande Armee had left Vienna and had crossed the Danube on the way to Moravia in pursuit of the Austrians.
The incident itself is on pages 180-182 in Volume I of the English translation of the memoirs and the story in itself is both fascinating and interesting to read.