I can't reproduce. Would you:

• Make sure you are using the latest version R & RStudio
• Run update.packages

If that doesn't work. Send me the two generated .bib files.

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I think you mean theses to files.

Thanks in advance!

bibfiles.zip

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Could you try creating and building this simple Rmd document:

---
title: "Untitled"
author: "Colin Gillespie"
date: "22 July 2016"
output: html_document
bibliography: [refs.bib]
---

```{r setup, include=FALSE}
knitr::write_bib("tibble", file="refs.bib")

test

[@R-tibble]

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I named it Test.Rmd
Press the knit HTML and gives me an error that I can´t cut and paste.

So I run from the console: > rmarkdown::render("test.Rmd")

And the output is:

processing file: test.Rmd
|................................ | 50%
ordinary text without R code

|.................................................................| 100%
label: setup (with options)
List of 1
$ include: logi FALSE

Quitting from lines 11-12 (test.Rmd)
Error in parse(text = x) : :4:25: unexpected symbol
3: person("Romain", "Francois", , "[email protected]", "aut"),
4: person("Kirill", "M"uller
^

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@jtruffa I think this might be bug in write_bib. See yihui/knitr#1256

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