The AP Stylebook is the ultimate resource when it comes to AP style. You can purchase it in several forms through the AP Stylebook website.
"The AP Stylebook is a writing style guide for journalists. It is published and updated annually to reflect changes in writing style and new guidelines.
Updated regularly since its initial publication in 1953, the AP Stylebook is a must-have reference for writers, editors, students and professionals. It provides fundamental guidelines for spelling, language, punctuation, usage and journalistic style. It is the definitive resource for journalists."--AP Stylebook
The Associated Press Stylebook 2017 by Remember that although AP Style is used by many different publications and media, it is designed for journalists writing news articles. AP Style uses in-text attribution generally in the form of direct or indirect quotations.
"Revenues are up 10,000 percent," said CEO John Smith.
According to SEC filings, company revenues are up 10,000 percent.
The only exceptions within the AP Stylebook are Photo Captions where the format is (Publication/Photographer) -- (AP Photo/Bill Smith).
When attributing to a specific article, video or other piece of content on another site, it is generally recommended to link to the item, unless the content might be objectionable to readers.