American Psychological Association (APA)
Headline. (n.d.). The Search Engine Marketing Glossary. Retrieved May 28, 2023, from website: http://www.expertglossary.com/definition/headline.
Chicago Manual of Style (CMS)
Headline. www.seobook.com. The Search Engine Marketing Glossary. SEO Book. http://www.expertglossary.com/definition/headline (accessed: May 28, 2023).
Modern Language Association (MLA)
"Headline." The Search Engine Marketing Glossary. SEO Book. 28 May. 2023 http://www.expertglossary.com/definition/headline.