Writing in APA Style - Version 1.1 This e-book will show you how to format your essay to conform to the style as set out in the Publication Manual of the American Psychological Association(5th ed.). It contains examples of referencing of the most common sources, the way to layout your essay, page headings, page spacing, font type and size, paragraph indents, how to enter in-text citation etc. and includes links to more APA information sites on the net.