CRAAP (Currency, Relevance, Authority, Accuracy, Purpose)

CRAAP is an acronym Currency, Relevance, Authority, Accuracy, Purpose

One way to ensure that your sources actually support your argument and aren’t merely filler is to apply the CRAAP Test.

CurrencyCurrent research may reinforce or, alternatively, repudiate prior research. 
RelevanceDoes the information directly support your argument, or is it merely interesting?
AuthorityWho is the author and what are his or her credentials? Is it written for an academic or for a general audience?
AccuracyIs the information from a reliable study or source? Is it verifiable?
PurposeWhat can you determine about the source’s purpose? Does it have political, ideological, cultural, or other biases that may slant the information?