You may want to know not only how many times your journal articles have been cited but also who is citing your articles. Citations to your articles can be tracked using these databases:
Google Scholar (free): Search for a particular work, then click Cited by [number] for a list of all articles citing that work.
Web of Science (WSU subscription): Search for a particular work, select that work, then look at the information in the Citation Network box to the right.
Scopus (WSU subscription): Search for a particular work, select that work, then look at the information in the Cited by [number] documents box to the right.
Note: These tools use different sources of publication and citation data and thus provide differing results.
N. Bakkalbasi, K. Bauer, J. Glover, L. Wang. (2006). Three options for citation tracking: Google Scholar, Scopus, and Web of Science. Biomed Digit Libr, 3: 7.
A.V. Kulkami, B. Aziz, I. Shams, J.W. Busse. (2009). Comparisons of citations in Web of Science, Scopus, and Google Scholar for articles published in general medical journals. JAMA, 302(10): 1092-1096.