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date: 14 April 2024

appendixes; appendices. 

Source:
Garner's Modern English Usage
Author(s):

Bryan Garner

Both are correct plural forms for appendix, but appendixes has long been considered preferable outside scientific contexts—e.g.:

“The authors of ‘The Bell Curve’ tell readers that they may limit their perusal to the summaries that precede each chapter, and that they may skip the main text. Still, ‘The Bell Curve’ is 845 pages long, and a reader who skips even the ...

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