EISS 13 aims to follow the Generic Style Rules for Linguistics (of December 2014), compiled by Martin Haspelmath. A local copy of the Generic Style Rules is also available.

Note that as far as the formatting of references is concerned, the LaTeX template includes the BibTeX style file glossa.bst (from Glossa), which aims to follow the Generic Style Rules for the formatting of references.

If some point isn't clear, please don't hesitate to ask.