1. Google Scholar: Stand on the shoulders of giants This must-have search engine for research lets you easily find relevant scholarly literature, such as books, theses, abstracts, and articles, across many disciplines and sources. Google Scholar ranks documents by taking into account the full text, where the document was published, who authored it, and how often and how recently it has been cited in other scholarly literature. Find literature from academic publishers, professional societies, universities, court opinions, and other credible organizations.
    2. Sweet Search: Since 2009, SweetSearch has been the best place for students - and anyone else - to begin their research. It leverages Google to search only a fully vetted "whitelist" of websites. The original index was created by 50+ librarians, educators and researchers who collectively invested over 100,000 hours in finding the best resources. They constantly evaluate our search results and "fine-tune" them. In the summer of 2017, they reviewed every link in the index, and scoured the entire web for new, worthy websites to add.
    3. refSeek: RefSeek is a web search engine for students and researchers that aims to make academic information easily accessible to everyone. RefSeek searches more than one billion documents, including web pages, books, encyclopedias, journals, and newspapers. RefSeek's unique approach offers students comprehensive subject coverage without the information overload of a general search engine—increasing the visibility of academic information and compelling ideas that are often lost in a muddle of sponsored links and commercial results.
    4. iSeek: iSEEK™ Education is a targeted search engine that compiles hundreds of thousands of authoritative resources from university, government, and established noncommercial providers. It provides time-saving intelligent search and a personal Web-based library to help you locate the most relevant results immediately and find them quickly later.
    5. Infotopia: Infotopia.info, a site created by school librarians for students and their teachers, is a directory and search engine including only websites recommended by teachers, librarians, and library and educational consortia. Infotopia is a Google custom search engine of selected sites, so you get reliable resources in your search results, while still enjoying Google`s search features.