There are several ways to cite information, from Modern Language Association (MLA) to American Psychological Association (APA), to Chicago School.  Which school of citation is going to be used varies. Always ask the teacher for the assignment requirements before using one form of citation over another.   

OWL Purdue stands for Online Writing Lab at Purdue University.  Once you are at the OWL Purdue website,  you may access the Modern Language Association (MLA) handbook, the  American Psychological Association (APA) handbook, and the Chicago School of citation. There are also additional writing resources present.