Some researchers use metrics like those listed below to determine the value of the source or publication.
Journal Impact Factor
Impact Factor (IF):the average number of times articles from the journal published in the past two years have been cited in the reference year.
Defintion: the relative location of a journal along the range of an Impact Factor distribution.
top 25% of the IF distribution (high)
between top 50% and top 25% of the IF distribution. (middle high)
top 75% to top 50% (middle low)
bottom 25% of the IF distribution (low)
The h5-index is the h-index for articles published in the last 5 complete years. It is the largest number h such that h articles published in 2008-2012 have at least h citations each” ---e.g. a h5-index of 100 means 100 articles were published in the 5 yr. time frame that have at least 100 citations each.
Apply the C.R.A.P. test when evaluating sources