In-text citations are usually placed at the end of a sentence or clause containing the information or information you wish to cite. It must precede punctuation marks like periods and commas. They argued that the measurements were necessary to obtain a valid result. Reurink et al. 2017, 118. Chicago style is a set of formatting and citation guidelines that tell you what an academic article should look like, similar to other styles like APA or MLA. Based on the Chicago Manual of Style, or CMOS, Chicago Style is the preferred format for citing sources related to history and historical topics. He is known for his comprehensive system, ~ Chicago Notes and Bibliography: Operations Research OR Some OR advisors require INFORMS: Physics PH IEEE preferred, but advisors may choose another citation style: Space Systems Academic Group SSAG IEEE or Chicago Author-Date , but advisors may choose another citation style: Systems Engineering SE Chicago Author, Citing in the Text. Chicago style, when referring to a source of information in the text of a document, in its simplest form gives a short citation consisting of the name of the author(s) and the date of publication. • Short references in the text are given in whole or in part in parentheses. SEO has two parts: the citations in the text of your article and the list of references at the end of your article. Chicago style is an author-date style, so the in-text citation consists of the author's name and year of publication, given in whole or in part in parentheses. Use only the author's and last name. ~The Chicago Manual of Style advises against citing secondary sources. A secondary source also called an indirect source is a source inserted into another source. In rare cases it is not possible to cite the original source. For example, if the source is out of print and inaccessible, or if it is written in another language,