The present style guide (Version 1.5 of October 10, 2019) has been created as result of the research project Open-Access-Hochschulverlag ( Open Access University Press ) at Leipzig University of Applied Sciences, Germany. The project was to develop a sustainable and adoptable workflow, which enables universities to publish their publications both as OA and printed books in a state-of-the-art publishing process and without any restrictions regarding the license, the variety of formats, print run etc. The style guide was created to characterise the internal layout of OA books, which have been published by our university press. To enable low-threshold transfer of knowledge how to publish OA books, this style guide has been published under Creative Commons Licence CC BY. Publishing monographs in a uniformly series design, the so house style, offers several advantages: it creates a recognition value for the user, so the publications are better remembered and the university press as a publisher becomes more visible as a brand. In addition, a uniform appearance ensures a consistent quality standard, as scientific publications can be highly structured and complex. Strict specifications facilitate the handling of those complex content and ensures the uniform appearance. The house style of our project consist of general specifications such as the selection of book formats, the basic structure of the scientific publication, page layout, baseline grids, fonts, colors, pagination and running titles, as well as rules for hyphenation and Document Object Identifier (DOI). Furthermore, specifications for the content-specific elements, which may occur in scientific publication are defined, such as heading hierarchies, footnotes, subtitles, lists and numbering, indents, formulas, source code, info boxes, figures and tables. Finally, the guideline includes further specifications, e.g. cover design, directories, appendix and specifications for the electronic output formats of the publication.