Google Scholar is a search that gives only results you can use in scholarly papers such as books and journal articles. It's a great way to find references for school papers or to get background research for fiction writing. Use the resources you find to figure out new keywords and make sure to check the reference lists of the relevant works to find more works.
WorldCat.org is a way to search a ton of different school, university, public, and government libraries at the same time. If you're trying to find an uncommon book that your school library doesn't have, search for it here and see if any libraries near you have it. You may be able to arrange to borrow it through an interlibrary loan through your library or you might be able to talk to someone at the other library about getting copies of relevant pages or getting a guest pass to visit the library to read it and takes notes.
Annual Reviews Journals (by subject) - these journals available in a wide range of subjects have literature review articles on particular topics. Find those closest to the topic of your paper and get a quick overview of all sorts of recent scholarly work related to it as well as an idea of how contemporary scholars interpret, think about, and frame the subject, plus a long list of other resources you can use in your own research.
Don't forget, if its for a school paper, check the assigned reading materials and their reference lists (more useful for reading lists than textbooks usually). You can also visit your professors during their office hours - they won't do the work of compiling a resource list for you, but if you have done a lot of work already, they may be able to point you in new directions, play devil's advocate and/or pose thinking questions for you, or suggest a couple of resources that may balance out your existing references.
WorldCat.org is a way to search a ton of different school, university, public, and government libraries at the same time. If you're trying to find an uncommon book that your school library doesn't have, search for it here and see if any libraries near you have it. You may be able to arrange to borrow it through an interlibrary loan through your library or you might be able to talk to someone at the other library about getting copies of relevant pages or getting a guest pass to visit the library to read it and takes notes.
Annual Reviews Journals (by subject) - these journals available in a wide range of subjects have literature review articles on particular topics. Find those closest to the topic of your paper and get a quick overview of all sorts of recent scholarly work related to it as well as an idea of how contemporary scholars interpret, think about, and frame the subject, plus a long list of other resources you can use in your own research.
Don't forget, if its for a school paper, check the assigned reading materials and their reference lists (more useful for reading lists than textbooks usually). You can also visit your professors during their office hours - they won't do the work of compiling a resource list for you, but if you have done a lot of work already, they may be able to point you in new directions, play devil's advocate and/or pose thinking questions for you, or suggest a couple of resources that may balance out your existing references.