MLA format is commonly used in Literature and throughout the Humanities. It uses in-text notation similar to APA.
Mendeley is a free reference manager that can help you store, organize, note, share and cite references and research data. It is a free, simple plugin for Microsoft Word (Windows, Mac). Their guides cover both in-text and reference list citations for a range of source types including books, articles, websites, and more.
See a librarian if you need help using this or any citation style.
Purdue University's Online Writing Lab is a popular source for citation help. And unlike the MLA Handbook, it's all online.