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.

• Click [number] Times Cited for a list of all articles citing that work.
• Click Create Citation Alert to receive notification of when that work is cited.

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.

• Click View all [number] citing documents for a list of all articles citing that work.
• Click Set Citation Alert to receive notification of when that work is cited.

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.