An increasing number of databases will allow you to see how often an article has been cited in that particular database, and/or search for a cited article or monograph within indexed articles references. In most cases only articles from recent years will have indexed reference lists.
Many publisher sites will allow you to find how often a work has been cited by articles in other journals the publisher publishes. Here are some examples:
Citation information is available through these databases/websites as well, which are particularly useful for humanities scholars.