2026 Guidebook for Writing a Scientific Article is a practical and professionally structured handbook designed to help authors prepare stronger, clearer, and more publishable manuscripts for the EIID scientific journals European Scientific e-Journal and Klironomy. Compiled by Dr. Alexander Buychik and published by Tuculart Edition in cooperation with the European Institute for Innovation Development, this edition offers a full methodological pathway from the initial choice of topic to the final pre-submission check of the article. It is intended for scholars, researchers, university lecturers, doctoral candidates, and independent authors who wish to align their work with contemporary international publication standards. The guidebook gives particular attention to IMRaD structure, APA referencing, academic integrity, text originality, abstract writing, author metadata, and the overall editorial culture of a high-quality research article. It also provides practical guidance on research methodology, literature review construction, the presentation of results, discussion and conclusions, as well as the correct use of tables, figures, appendices, and additional transparency sections such as Conflict of Interest, Funding, Ethics, Data Availability, and Code Availability. Especially valuable is its combination of academic rigour and procedural clarity: the book does not merely describe formal requirements, but translates them into a workable system for real manuscript preparation. The publication is particularly relevant for authors in the humanities and social sciences, while remaining fully useful for interdisciplinary researchers seeking a disciplined and internationally intelligible model of scholarly writing. It is, in essence, both a methodological guide and an editorial roadmap for anyone who wants to move from a promising idea to a submission-ready article. For authors aiming to reduce revision time, improve argumentation, and strengthen the professional presentation of their research, this guidebook offers a reliable and timely resource.