Elementary reading about why we might doubt Excluded Middle?

If, by some chance, you were writing a couple of pages of recommendations for “Further reading” for an elementary logic book, and wanted an entry on constructivist doubts about the Law of Excluded Middle, what would you choose?

Ideally something short, accessible (in the sense of being easy to understand for a near beginner), accessible (in the sense of being available online or in most university libraries). Bell/DeVidi/Solomon, Logical Options, pp. 193–195 is, well, an option. But any alternatives come to mind?

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