APA style is referring to the editorial style that has been adopted to present written material in the social and behavioral sciences. APA's style rules and guidelines are set out in a reference book ”The Publication Manual of the American Psychological Association” to ensure clear and consistent presentation of written material such as punctuations, abbreviations, construction of tables, selection of headings, citation of references, presentation of statistics and so on. The APA's Publication Manual provides complete style guidelines to help clarity frequent areas of confusion. To reduce written variations in style, an author's writing for a publication must follow the rules. Numerous changes have been made between the 4(superscript th) and the new 5(superscript th) edition of APA's Publication Manual. This article attempts to offer useful information to help readers avoid inconsistencies among academic works. Due to space limitations, certain changes can only be summarized. Readers may preferrably refer to the new 5(superscript th) edition for specific information.