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This site from Trinity College presents visual information about how to cite various sources in a visual way, and they offer guidance on citing tricky sources. Check out the source help for ALA, Chicago, and MLA styles.
How do you determine if a source is credible? You can evaluate the reliability and scholarship of information you find both online and in print by using these guidelines.
OWL has lots of general and subject-specific writing tips and techniques, along with research advice and detailed citation and formatting standards for the APA, MLA, and Chicago styles.
Writing about Literature combines detailed practical and scholarly advice with a sense of the scope and creative possibilities of literary criticism, empowering the student reader to make their own discoveries and experiments with language. In addition, it gives valuable guidance on adult language learning and translation skills for students of literatures not in their first languages. The guide covers many aspects of the essay-writing process, including: preliminary reading and choosing and researching a topic referencing and presentation computer use style, structure, vocabulary, grammar and spelling the art and craft of writing scholarly and personal insights into the problems and pleasures of writing about literature.
The Craft of Research by 
Writing about Literature by