To cite package ‘emld’ in publications use:

  Boettiger, (2019). Ecological Metadata as Linked Data. Journal of
  Open Source Software, 4(34), 1276,
  https://doi.org/10.21105/joss.01276

A BibTeX entry for LaTeX users is

  @Article{,
    title = {Ecological Metadata as Linked Data. Journal of Open Source Software},
    author = {Carl Boettiger},
    month = {feb},
    year = {2019},
    publisher = {The Open Journals},
    journal = {The Journal of Open Source Software},
    number = {34},
    volume = {4},
    pages = {1276},
    doi = {10.21105/joss.01276},
    url = {https://doi.org/10.21105/joss.01276},
  }