As late as 1891 Rogers in his technical glossary recorded only the form incunabulum: Rogers, Walter Thomas. A Manual of Bibliography 2nd. London: H. Grevel. 1891: 195.
The British Library Incunabula Short Title Catalogue (页面存档备份,存于互联网档案馆) (retrieved 16 August 2021) gives 30,518 editions, though this includes some which have been re-dated to the early 16th century.
BL.uk (页面存档备份,存于互联网档案馆), consulted in 2007. The figures are subject to slight change as new copies are reported. Exact figures are given but should be treated as close estimates; they refer to extant editions.
J. Green, F. McIntyre, P. Needham (2011), "The Shape of Incunable Survival and Statistical Estimation of Lost Editions", Papers of the Bibliographical Society of America 105 (2), pp. 141–175. doi:https://doi.org/10.1086/680773
Carter, John; Barker, Nicolas. ABC for Book Collectors 8th. New Castle, Del.: Oak Knoll Press and the British Library. 2004: 172 [28 May 2010]. ISBN 1-58456-112-2. (原始内容(PDF)存档于21 November 2017).
The British Library Incunabula Short Title Catalogue (页面存档备份,存于互联网档案馆) (retrieved 16 August 2021) gives 30,518 editions, though this includes some which have been re-dated to the early 16th century.
Carter, John; Barker, Nicolas. ABC for Book Collectors 8th. New Castle, Del.: Oak Knoll Press and the British Library. 2004: 172 [28 May 2010]. ISBN 1-58456-112-2. (原始内容(PDF)存档于21 November 2017).
BL.uk (页面存档备份,存于互联网档案馆), consulted in 2007. The figures are subject to slight change as new copies are reported. Exact figures are given but should be treated as close estimates; they refer to extant editions.