We cite sources for several reasons:
There are thousands of citation styles. One popular example is APA 7th edition. Be sure to check out the tutorial.
To cite your references properly, you must track the following information for all your resources:
Padilla, PB, & Nogales M (2009). Behavior of Kestrels Feeding on Frugivorious Lizards: Implications for Food Dispersal. Behavioral Ecology, 20(4), 872-877
Be sure to use a citation manager such as EndNote Online to store, organize and manage your citations!
Authority
Who created the resource? Are the author, organization, affiliations, and publisher clearly shown? If the page is web-based does it link to information about the organization? Do the author have credentials or expertise in the subject matter? Is the resource from a government agency, university, company, non-profit organization?
Accuracy
Is the information contained in the source properly cited? Is there a bibliography or reference list? Can you verify the information in other sources? Is the information free of grammatical, spelling, and typographical errors? Are the statistical data clearly explained? Are charts and graphs properly represented and cited?
Objectivity
Is the resource free of advertising, or is any advertising clearly separated from the content? Is there any bias? Is the sponsoring organization biased or motivated to report facts from a particular perspective?
Currency
When was the information gathered? When was the resource created? When was it updated/ revised? Is it kept current? Is currency critical to your topic?
Coverage
Is the information complete? Does it cover the subject in depth? Does it match your information needs?
These criteria were adapted from a worksheet used by the Widener Science Library.