You don’t need to use a citation when a common fact, statistic, etc. is found in all of your sources. For example:
The Civil War started in 1861.
Many farmers lost their land during the Dust Bowl.
The case Plessy vs. Ferguson established that facilities must be “separate but equal.”
#1-2 The basic citations: If you mention the author’s name: Smith says, “Quote Quote Quote” (105). If you don’t mention the author’s name: “ Quote Quote Quote” (Smith 105).
#5 An electronic source: Use the same format as a printed source: (Author page #) However, omit the page number if you don’t know it (i.e. you printed an Ebsco or SIRS article and not the original article)